001 - Statement - CONSOLIDATED STATEMENTS OF INCOME link:presentationLink link:definitionLink link:calculationLink 002 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:definitionLink link:calculationLink 003 - Statement - CONSOLIDATED BALANCE SHEETS (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 004 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:definitionLink link:calculationLink 005 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 006 - Statement - CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT link:presentationLink link:definitionLink link:calculationLink 007 - Statement - CONSOLIDATED STATEMENTS OF CAPITAL STOCK AND LONG-TERM DEBT (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 008 - Statement - CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY link:presentationLink link:definitionLink link:calculationLink 009 - Statement - CONSOLIDATED STATEMENTS OF COMMON STOCKHOLDERS' EQUITY (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 010 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments link:presentationLink link:definitionLink link:calculationLink 011 - Disclosure - Rate and Regulatory Matters link:presentationLink link:definitionLink link:calculationLink 012 - Disclosure - Income Taxes link:presentationLink link:definitionLink link:calculationLink 013 - Disclosure - Commitments and Contingent Liabilities link:presentationLink link:definitionLink link:calculationLink 014 - Disclosure - Short-term Borrowings link:presentationLink link:definitionLink link:calculationLink 015 - Disclosure - Capitalization link:presentationLink link:definitionLink link:calculationLink 016 - Disclosure - Employee Benefit Plans link:presentationLink link:definitionLink link:calculationLink 017 - Disclosure - Business Segment Data link:presentationLink link:definitionLink link:calculationLink 018 - Disclosure - Quarterly Data - Unaudited link:presentationLink link:definitionLink link:calculationLink 019 - Disclosure - Accounting Policies, by Policy (Policies) link:presentationLink link:definitionLink link:calculationLink 020 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Tables) link:presentationLink link:definitionLink link:calculationLink 021 - Disclosure - Rate and Regulatory Matters (Tables) link:presentationLink link:definitionLink link:calculationLink 022 - Disclosure - Income Taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 023 - Disclosure - Commitments and Contingent Liabilities (Tables) link:presentationLink link:definitionLink link:calculationLink 024 - Disclosure - Short-term Borrowings (Tables) link:presentationLink link:definitionLink link:calculationLink 025 - Disclosure - Capitalization (Tables) link:presentationLink link:definitionLink link:calculationLink 026 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:definitionLink link:calculationLink 027 - Disclosure - Business Segment Data (Tables) link:presentationLink link:definitionLink link:calculationLink 028 - Disclosure - Quarterly Data - Unaudited (Tables) link:presentationLink link:definitionLink link:calculationLink 029 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) link:presentationLink link:definitionLink link:calculationLink 030 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) - Schedule of depreciation rates link:presentationLink link:definitionLink link:calculationLink 031 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) - Schedule of allowance for funds used during construction rates link:presentationLink link:definitionLink link:calculationLink 032 - Disclosure - Organization, Summary of Significant Accounting Policies and Recent Developments (Details) - Schedule of operating revenues link:presentationLink link:definitionLink link:calculationLink 033 - Disclosure - Rate and Regulatory Matters (Details) link:presentationLink link:definitionLink link:calculationLink 034 - Disclosure - Rate and Regulatory Matters (Details) - Schedule of regulatory assets link:presentationLink link:definitionLink link:calculationLink 035 - Disclosure - Income Taxes (Details) link:presentationLink link:definitionLink link:calculationLink 036 - Disclosure - Income Taxes (Details) - Schedule of income tax expense reconciliation link:presentationLink link:definitionLink link:calculationLink 037 - Disclosure - Income Taxes (Details) - Schedule of income tax expense link:presentationLink link:definitionLink link:calculationLink 038 - Disclosure - Income Taxes (Details) - Schedule of net deferred tax liability link:presentationLink link:definitionLink link:calculationLink 039 - Disclosure - Commitments and Contingent Liabilities (Details) link:presentationLink link:definitionLink link:calculationLink 040 - Disclosure - Commitments and Contingent Liabilities (Details) - Schedule of purchased water costs link:presentationLink link:definitionLink link:calculationLink 041 - Disclosure - Commitments and Contingent Liabilities (Details) - Schedule of operating lease ROU assets link:presentationLink link:definitionLink link:calculationLink 042 - Disclosure - Commitments and Contingent Liabilities (Details) - Schedule of future minimum operating lease commitments link:presentationLink link:definitionLink link:calculationLink 043 - Disclosure - Short-term Borrowings (Details) link:presentationLink link:definitionLink link:calculationLink 044 - Disclosure - Short-term Borrowings (Details) - Schedule of information regarding short-term borrowings link:presentationLink link:definitionLink link:calculationLink 045 - Disclosure - Short-term Borrowings (Details) - Schedule of Line of Credit link:presentationLink link:definitionLink link:calculationLink 046 - Disclosure - Capitalization (Details) link:presentationLink link:definitionLink link:calculationLink 047 - Disclosure - Capitalization (Details) - Schedule of long-term debt link:presentationLink link:definitionLink link:calculationLink 048 - Disclosure - Capitalization (Details) - Schedule of basic and diluted earnings per share link:presentationLink link:definitionLink link:calculationLink 049 - Disclosure - Capitalization (Details) - Schedule of basic and diluted earnings per share (Parentheticals) link:presentationLink link:definitionLink link:calculationLink 050 - Disclosure - Capitalization (Details) - Schedule of carrying amount and fair value of the bonds link:presentationLink link:definitionLink link:calculationLink 051 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:definitionLink link:calculationLink 052 - Disclosure - Employee Benefit Plans (Details) - Schedule of pension plan and other benefits plan link:presentationLink link:definitionLink link:calculationLink 053 - Disclosure - Employee Benefit Plans (Details) - Schedule of change in fair value of plan assets link:presentationLink link:definitionLink link:calculationLink 054 - Disclosure - Employee Benefit Plans (Details) - Schedule of employee benefit plans recognized in balance sheet link:presentationLink link:definitionLink link:calculationLink 055 - Disclosure - Employee Benefit Plans (Details) - Schedule of components of net benefit cost link:presentationLink link:definitionLink link:calculationLink 056 - Disclosure - Employee Benefit Plans (Details) - Schedule of regulatory assets into net periodic benefit cost link:presentationLink link:definitionLink link:calculationLink 057 - Disclosure - Employee Benefit Plans (Details) - Schedule of discount and compensation rates link:presentationLink link:definitionLink link:calculationLink 058 - Disclosure - Employee Benefit Plans (Details) - Schedule of effect of one-percentage point change in assumed health care cost trend rates link:presentationLink link:definitionLink link:calculationLink 059 - Disclosure - Employee Benefit Plans (Details) - Schedule of expected benefit payments link:presentationLink link:definitionLink link:calculationLink 060 - Disclosure - Employee Benefit Plans (Details) - Schedule of allocation of plan assets link:presentationLink link:definitionLink link:calculationLink 061 - Disclosure - Employee Benefit Plans (Details) - Schedule of fair value of plan assets link:presentationLink link:definitionLink link:calculationLink 062 - Disclosure - Employee Benefit Plans (Details) - Schedule of table presents awarded but not yet vested share link:presentationLink link:definitionLink link:calculationLink 063 - Disclosure - Business Segment Data (Details) - Schedule of segment reporting information, by segment link:presentationLink link:definitionLink link:calculationLink 064 - Disclosure - Quarterly Data - Unaudited (Details) - Schedule of financial information for each quarter link:presentationLink link:definitionLink link:calculationLink 000 - Document - Document And Entity Information link:presentationLink link:definitionLink link:calculationLink