CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities
Net income	$ 12,437	$ 14,050
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	30,088	28,554
Change in value of life insurance contracts	(504)	(1,635)
Other changes in noncurrent assets and liabilities	1,350	(1,658)
Changes in operating assets and liabilities:
Receivables	(19,686)	(20,701)
Accounts payable	8,787	8,879
Other current assets	(3,889)	(5,108)
Other current liabilities	8,193	9,716
Net cash provided by operating activities	36,776	32,097
Investing activities:
Utility plant expenditures	(66,190)	(61,984)
Purchase of life insurance	(1,608)	(1,357)
Change in restricted cash and other changes	1,079	6
Net cash used in investing activities	(66,719)	(63,335)
Financing activities:
Short-term borrowings	32,615	62,635
Repayment of short-term borrowings	(93,275)	(22,000)
Proceeds from long-term debt	48	123
Repayment of long-term debt	(2,553)	(1,645)
Advances and contributions in aid of construction	5,006	2,760
Refunds of advances for construction	(3,512)	(3,835)
Issuance of common stock	110,688
Common stock issuance cost	(4,853)
Dividends paid	(14,343)	(13,187)
Net cash provided by financing activities	29,821	24,851
Change in cash and cash equivalents	(122)	(6,387)
Cash and cash equivalents at beginning of period	38,790	27,203
Cash and cash equivalents at end of period	38,668	20,816
Supplemental information
Cash paid for interest (net of amounts capitalized)	14,383	13,143
Cash paid for income taxes	0
Supplemental disclosure of non-cash activities:
Accrued payables for investments in utility plant	9,492	8,998
Utility plant contribution by developers	$ 6,809	$ 8,710