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Disclosure - Commitments and Contingent Liabilities (Schedule of Purchased Water Costs) (Details) link:presentationLink link:calculationLink link:definitionLink 00000040 - Disclosure - Commitments and Contingent Liabilities (Schedule of Future Minimum Operating Lease) (Details) link:presentationLink link:calculationLink link:definitionLink 00000041 - Disclosure - Short Term Borrowings (Details) link:presentationLink link:calculationLink link:definitionLink 00000042 - Disclosure - Capitalization (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 00000043 - Disclosure - Capitalization (Schedule of Maturities of Long-term Debt) (Details) link:presentationLink link:calculationLink link:definitionLink 00000044 - Disclosure - Capitalization (Schedule of Earnings Per Share) (Details) link:presentationLink link:calculationLink link:definitionLink 00000045 - Disclosure - Capitalization (Schedule of Carrying Amount and Fair Value of Bonds) (Details) link:presentationLink link:calculationLink link:definitionLink 00000046 - 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Disclosure - Employee Benefit Plans (Schedule of Discount and Compensation Rates) (Details) link:presentationLink link:calculationLink link:definitionLink 00000053 - Disclosure - Employee Benefit Plans (Schedule of Effect of One-percentage Point Change in Assumed Health Care Cost Trend Rates) (Details) link:presentationLink link:calculationLink link:definitionLink 00000054 - Disclosure - Employee Benefit Plans (Schedule of Expected Benefit Payments) (Details) link:presentationLink link:calculationLink link:definitionLink 00000055 - Disclosure - Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 00000056 - Disclosure - Employee Benefit Plans (Schedule of Fair Value of Pension Plan Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 00000057 - Disclosure - Employee Benefit Plans (Schedule of Fair Value of Other Benefits Plan Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 00000058 - Disclosure - Employee Benefit Plans (Schedule of Restricted Stock Plan) (Details) link:presentationLink link:calculationLink link:definitionLink 00000059 - Disclosure - Business Segment Data (Details) link:presentationLink link:calculationLink link:definitionLink 00000060 - Disclosure - Quarterly Data - Unaudited (Details) link:presentationLink link:calculationLink link:definitionLink