CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 36,660	$ 30,256
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	55,434	48,929
Deferred income taxes	22,588	15,188
Amortization of investment tax credits	(262)	(264)
Allowance for equity funds used during construction	(3,038)	(1,728)
Net derivative losses	115	138
Other, net	(1,505)	0
Changes in operating assets and liabilities:
Accounts receivable	(295)	4,599
Accrued unbilled revenues	10,846	6,072
Inventories	2,669	5,429
Other current assets	(58)	329
Accounts payable	28,882	12,907
Net regulatory assets and liabilities	(3,112)	1,555
Other current liabilities	(9,191)	589
Pension and other employee benefit obligations	(8,735)	(6,848)
Change in other noncurrent assets	(359)	(393)
Change in other noncurrent liabilities	(2,696)	555
Net cash provided by operating activities	127,943	117,313
Investing activities
Utility capital/construction expenditures	(90,735)	(87,791)
Allowance for equity funds used during construction	3,038	1,728
Other, net	(33)	687
Net cash used in investing activities	(87,730)	(85,376)
Financing activities
Repayments of short-term borrowings, net	(14,000)	(2,000)
Repayments of long-term debt	(27)	(29)
Capital contributions from (to) parent	12,282	(1,545)
Dividends paid to parent	(38,800)	(27,850)
Other, net	(70)	0
Net cash used in financing activities	(40,615)	(31,424)
Net change in cash and cash equivalents	(402)	513
Cash and cash equivalents at beginning of period	1,546	1,079
Cash and cash equivalents at end of period	1,144	1,592
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(15,062)	(15,718)
Cash paid for income taxes, net	(9,699)	(3,336)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 21,867	$ 10,220