CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities
Net income	$ 58,985	$ 54,477
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	83,797	74,014
Deferred income taxes	37,226	27,769
Amortization of investment tax credits	(392)	(396)
Allowance for equity funds used during construction	(4,743)	(2,969)
Net derivative losses	82	112
Other, net	(1,503)	0
Changes in operating assets and liabilities:
Accounts receivable	3,512	9,394
Accrued unbilled revenues	9,414	8,203
Inventories	(1,798)	1,290
Other current assets	4,990	7,791
Accounts payable	1,031	11,946
Net regulatory assets and liabilities	(19,309)	(10,256)
Other current liabilities	(9,700)	1,523
Pension and other employee benefit obligations	(8,189)	(6,256)
Change in other noncurrent assets	(362)	(402)
Change in other noncurrent liabilities	(4,165)	1,918
Net cash provided by operating activities	148,876	178,158
Investing activities
Utility capital/construction expenditures	(145,440)	(138,616)
Allowance for equity funds used during construction	4,743	2,969
Other, net	(10)	781
Net cash used in investing activities	(140,707)	(134,866)
Financing activities
Proceeds from (repayments of) short-term borrowings, net	32,000	(6,000)
Repayments of long-term debt	(71)	(44)
Capital contributions from parent	12,297	1,108
Dividends paid to parent	(52,640)	(38,414)
Other, net	(70)	0
Net cash used in financing activities	(8,484)	(43,350)
Net change in cash and cash equivalents	(315)	(58)
Cash and cash equivalents at beginning of period	1,546	1,079
Cash and cash equivalents at end of period	1,231	1,021
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(21,496)	(21,692)
Cash paid for income taxes, net	(9,339)	(2,298)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 25,796	$ 16,011