CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating activities
Net income	$ 77,613	$ 58,985
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	94,925	83,797
Deferred income taxes	15,844	37,226
Amortization of investment tax credits	(393)	(392)
Allowance for equity funds used during construction	(6,732)	(4,743)
Net derivative losses	104	82
Other, net	498	(1,503)
Changes in operating assets and liabilities:
Accounts receivable	8,781	3,512
Accrued unbilled revenues	15,341	9,414
Inventories	(627)	(1,798)
Other current assets	5,109	4,990
Accounts payable	(7,546)	1,031
Net regulatory assets and liabilities	(13,611)	(19,309)
Other current liabilities	(4,924)	(9,700)
Pension and other employee benefit obligations	(8,631)	(8,189)
Change in other noncurrent assets	70	(362)
Change in other noncurrent liabilities	1,323	(4,165)
Net cash provided by operating activities	177,144	148,876
Investing activities
Utility capital/construction expenditures	(181,281)	(145,440)
Allowance for equity funds used during construction	6,732	4,743
Other, net	211	(10)
Net cash used in investing activities	(174,338)	(140,707)
Financing activities
(Repayments of) and proceeds from short-term borrowings, net	(11,000)	32,000
Proceeds from Issuance of Long-term Debt	197,110	0
Repayments of long-term debt	(19)	(71)
Capital contributions from parent	6,904	12,297
Dividends paid to parent	(47,986)	(52,640)
Other, net	(67)	(70)
Net cash provided by (used in) financing activities	144,942	(8,484)
Net change in cash and cash equivalents	147,748	(315)
Cash and cash equivalents at beginning of period	1,403	1,546
Cash and cash equivalents at end of period	149,151	1,231
Supplemental disclosure of cash flow information:
Cash paid for interest (net of amounts capitalized)	(22,016)	(21,496)
Cash paid for income taxes, net	(15,833)	(9,339)
Supplemental disclosure of non-cash investing transactions:
Property, plant and equipment additions in accounts payable	$ 22,731	$ 25,796