Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 32,077	$ 16,476
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of electric plant in service	44,429	47,145
Amortization of nuclear fuel	21,100	21,957
Deferred income taxes, net	15,339	6,695
Allowance for equity funds used during construction	(1,541)	(4,469)
Other amortization and accretion	9,991	8,715
Gain on sale of property, plant and equipment	0	(545)
Net gains on sale of decommissioning trust funds	(7,357)	(3,498)
Other operating activities	(641)	721
Change in:
Accounts receivable	(32,684)	(39,117)
Inventories	(2,791)	1,315
Net under/over-collection of fuel revenues	2,667	(1,990)
Prepayments and other	(6,294)	(6,273)
Accounts payable	(1,262)	(9,345)
Taxes accrued	(4,014)	(5,437)
Interest accrued	86	618
Other current liabilities	3,530	13,625
Deferred charges and credits	(4,644)	(5,900)
Net cash provided by operating activities	67,991	40,693
Cash flows from investing activities:
Cash additions to utility property, plant and equipment	(108,113)	(102,785)
Cash additions to nuclear fuel	(20,647)	(20,478)
Capitalized interest and AFUDC:
Utility property, plant and equipment	(3,043)	(7,502)
Nuclear fuel and other	(2,638)	(2,495)
Allowance for equity funds used during construction	1,541	4,469
Decommissioning trust funds:
Purchases, including funding of $2.3 million and $2.2 million, respectively	(65,960)	(44,937)
Sales and maturities	62,531	40,712
Proceeds from sale of property, plant, and equipment	0	596
Other investing activities	797	2,771
Net cash used for investing activities	(135,532)	(129,649)
Cash flows from financing activities:
Dividends paid	(26,157)	(24,474)
Borrowings under the revolving credit facility:
Proceeds	292,404	172,125
Payments	(195,094)	(212,249)
Proceeds from issuance of senior notes	0	157,052
Other financing activities	(757)	(2,040)
Net cash provided by financing activities	70,396	90,414
Net increase in cash and cash equivalents	2,855	1,458
Cash and cash equivalents at beginning of period	8,420	8,149
Cash and cash equivalents at end of period	$ 11,275	$ 9,607