Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 91,112	$ 81,270
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of electric plant in service	63,097	67,080
Amortization of nuclear fuel	33,088	32,864
Deferred income taxes, net	48,457	32,090
Allowance for equity funds used during construction	(5,867)	(8,417)
Other amortization and accretion	12,102	13,273
Gain on sale of property, plant and equipment	(545)	(587)
Net gains on sale of decommissioning trust funds	(5,570)	(7,887)
Other operating activities	871	387
Change in:
Accounts receivable	(46,371)	(33,156)
Inventories	(16)	(3,226)
Net over-collection (under-collection) of fuel revenues	(11,766)	10,934
Prepayments and other	(4,467)	(5,401)
Accounts payable	6,994	(14,397)
Taxes accrued	4,560	8,747
Interest accrued	6,700	4,078
Other current liabilities	1,218	2,005
Deferred charges and credits	(16,817)	(3,227)
Net cash provided by operating activities	176,780	176,430
Cash flows from investing activities:
Cash additions to utility property, plant and equipment	(168,830)	(211,516)
Cash additions to nuclear fuel	(29,929)	(30,483)
Capitalized interest and AFUDC:
Utility property, plant and equipment	10,031	13,782
Nuclear fuel	(3,738)	(3,758)
Allowance for equity funds used during construction	5,867	8,417
Decommissioning trust funds:
Purchases, including funding of $3.4 million	(66,463)	(70,016)
Sales and maturities	60,165	63,776
Proceeds from sale of property, plant, and equipment	3,251	644
Other investing activities	3,383	(627)
Net cash used for investing activities	(206,325)	(257,345)
Cash flows from financing activities:
Dividends paid	(37,021)	(35,138)
Borrowings under the revolving credit facility:
Proceeds	269,977	266,779
Payments	(356,523)	(162,618)
Payment on maturing RGRT senior notes	0	15,000
Proceeds from issuance of senior notes	157,052	0
Other financing activities	(2,045)	(1,039)
Net cash provided by financing activities	31,440	52,984
Net increase (decrease) in cash and cash equivalents	1,895	(27,931)
Cash and cash equivalents at beginning of period	8,149	40,504
Cash and cash equivalents at end of period	$ 10,044	$ 12,573