Consolidated Statments of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities:
Net income	$ 56,738	$ 47,254	$ 48,828
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	63,322	60,250	56,866
Amortization of debt premium and expenses	797	1,081	1,107
Changes in deferred income taxes	34,125	9,800	34,133
Other changes in noncurrent assets and liabilities	(15,318)	10,244	(9,932)
Change in value of life insurance contracts	(994)	(1,878)	(2,504)
Stock-based compensation	2,195us-gaap_ShareBasedCompensation	1,832us-gaap_ShareBasedCompensation	1,442us-gaap_ShareBasedCompensation
(Gain) on sale of non-utility property	(51)us-gaap_GainLossOnDispositionOfAssets		(84)us-gaap_GainLossOnDispositionOfAssets
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Receivables	4,983us-gaap_IncreaseDecreaseInReceivables	(7,201)us-gaap_IncreaseDecreaseInReceivables	(1,392)us-gaap_IncreaseDecreaseInReceivables
Unbilled revenue	(6,706)	(1,640)	(326)
Taxes, prepaid expenses, and other assets	(4,160)	1,490	(3,322)
Accounts payable	(1,370)	3,809	879
Other current liabilities	(5,428)	(868)	6,219
Net cash provided by operating activities	128,133	124,173	131,914
Investing activities:
Utility plant expenditures	(132,015)	(122,988)	(127,681)
Proceeds from sale of non-utility assets	57		85
Purchase of life insurance	(3,207)	(3,281)	(3,294)
Change in restricted cash	396	1,073	1,959
Net cash used in investing activities	(134,769)	(125,196)	(128,931)
Financing activities:
Short-term borrowings	117,300us-gaap_ProceedsFromShortTermDebt	70,615us-gaap_ProceedsFromShortTermDebt	94,335us-gaap_ProceedsFromShortTermDebt
Repayment of short-term borrowings	(85,000)us-gaap_RepaymentsOfShortTermDebt	(113,275)us-gaap_RepaymentsOfShortTermDebt	(52,000)us-gaap_RepaymentsOfShortTermDebt
Issuance of common stock		110,688
Common stock issuance costs		(5,111)us-gaap_PaymentsOfStockIssuanceCosts
Issuance of long-term debt	497	48	124
Advances and contributions in aid of construction	12,329	10,563	6,966
Refunds of advances for construction	(6,641)	(6,922)	(7,397)
Retirement of long-term debt	(8,705)us-gaap_RepaymentsOfLongTermDebt	(47,248)us-gaap_RepaymentsOfLongTermDebt	(7,037)us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(31,063)us-gaap_PaymentsOfDividendsCommonStock	(29,619)us-gaap_PaymentsOfDividendsCommonStock	(26,387)us-gaap_PaymentsOfDividendsCommonStock
Net cash (used in) provided by financing activities	(1,283)	(10,261)	8,604
Change in cash and cash equivalents	(7,919)	(11,284)	11,587
Cash and cash equivalents at beginning of period	27,506	38,790	27,203
Cash and cash equivalents at end of period	19,587	27,506	38,790
Cash paid (received) during the year for:
Interest (net of amounts capitalized)	21,722us-gaap_InterestPaidNet	28,171us-gaap_InterestPaidNet	27,120us-gaap_InterestPaidNet
Income taxes		7,700us-gaap_IncomeTaxesPaid
Income tax refunds	(6,000)us-gaap_ProceedsFromIncomeTaxRefunds		(5,349)us-gaap_ProceedsFromIncomeTaxRefunds
Supplemental disclosure of non-cash activities:
Accrued payables for investments in utility plant	15,621	9,932	11,048
Utility plant contribution by developers	11,556	17,329	13,630
Litigation proceeds for MTBE contamination reclassified from other long-term liabilities to CIAC		$ 7,029	$ 4,462

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The cash outflow for the purchase of a facility and equipment that provides water supply which includes wells, reservoirs, pumping stations, and control facilities; and waste water systems which includes the waste treatment and disposal facility and equipment to households and industry.

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The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties.

+ References

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The amount of cash received during the period as refunds for the overpayment of taxes.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The cash outflow for the payments made by the entity, generally on a straight-line basis over periods ranging from five to forty years to developers, builders, government agencies and municipalities for borrowings received in construction.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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