CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 22,419	$ 17,631
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	27,425	24,829
Deferred income taxes	11,348	5,284
Amortization of investment tax credits	(131)	(132)
Allowance for equity funds used during construction	(1,287)	(810)
Net derivative losses	166	200
Changes in operating assets and liabilities:
Accounts receivable	(10,867)	(2,797)
Accrued unbilled revenues	12,986	7,326
Inventories	4,806	6,717
Other current assets	4,305	6,348
Accounts payable	19,809	2,325
Net regulatory assets and liabilities	656	1,856
Other current liabilities	(9,158)	3,492
Pension and other employee benefit obligations	(8,860)	(7,264)
Change in other noncurrent assets	(294)	(319)
Change in other noncurrent liabilities	(800)	798
Net cash provided by operating activities	72,523	65,484
Investing activities
Utility capital/construction expenditures	(47,999)	(44,655)
Allowance for equity funds used during construction	1,287	810
Other, net	(159)	292
Net cash used in investing activities	(46,871)	(43,553)
Financing activities
Repayments of short-term borrowings, net	(27,000)	(5,000)
Repayments of long-term debt	(13)	(14)
Capital contributions from (to) parent	12,282	(1,545)
Dividends paid to parent	(10,729)	(15,322)
Other, net	(70)	0
Net cash used in financing activities	(25,530)	(21,881)
Net change in cash and cash equivalents	122	50
Cash and cash equivalents at beginning of period	1,546	1,079
Cash and cash equivalents at end of period	1,668	1,129
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(6,020)	(6,305)
Cash paid for income taxes, net	(11,489)	(2,424)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 15,150	$ 9,586