CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 36,540	$ 45,344
Adjustments to reconcile net income to net cash:
Depreciation and amortization	47,406	48,481
Change in value of life insurance contracts	758	(501)
Changes in operating assets and liabilities:
Receivables	(18,412)	(13,781)
Accounts payable	7,245	7,239
Other current assets	(2,428)	(6,859)
Other current liabilities	11,939	6,904
Other changes in noncurrent assets and liabilities	33,476	13,340
Net cash provided by operating activities	116,524	100,167
Investing activities:
Utility plant expenditures	(118,309)	(86,258)
Purchase of life insurance contracts	(1,855)	(3,207)
Change in restricted cash	(241)	354
Net cash used in investing activities	(120,405)	(89,111)
Financing activities:
Short-term borrowings	82,500	99,900
Repayment of short-term borrowings	(25,000)	(85,000)
Debt issuance costs	(1,197)	0
Proceeds from long-term debt	50	0
Repayment of long-term debt	(2,878)	(4,604)
Advances and contributions in aid of construction	10,741	8,780
Refunds of advances for construction	(5,050)	(4,858)
Dividends paid	(24,047)	(23,295)
Net cash provided by (used in) financing activities	35,119	(9,077)
Change in cash and cash equivalents	31,238	1,979
Cash and cash equivalents at beginning of period	19,587	27,506
Cash and cash equivalents at end of period	50,825	29,485
Supplemental information:
Cash paid for interest (net of amounts capitalized)	13,618	14,102
Income tax refunds	0	(6,000)
Supplemental disclosure of non-cash activities:
Accrued payables for investments in utility plant	24,856	16,308
Utility plant contribution by developers	$ 5,573	$ 8,148