Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Revenues
Member electric sales	$ 282,415	$ 271,769
Non-member electric sales	35,158	30,122
Other	20,856	21,571
Total revenues	338,429	323,462
Operating expenses
Purchased power	76,419	71,035
Fuel	60,813	60,990
Production	49,561	50,982
Transmission	33,800	36,460
General and administrative	7,180	5,110
Depreciation, amortization, and depletion	46,672	38,903
Coal mining	8,176	8,273
Other	4,790	5,330
Operating expenses	287,411	277,083
Operating margins	51,018	46,379
Other income
Interest	1,085	1,074
Capital credits from cooperatives	4,246	4,511
Membership withdrawal	2,500
Other income	1,020	1,041
Total other income	8,851	6,626
Interest expense, net of amounts capitalized	36,349	35,420
Income tax expense (benefit)	(302)	0
Net margins including noncontrolling interest	23,822	17,585
Net income attributable to noncontrolling interest	(296)	(52)
Net margins attributable to the Association	$ 23,526	$ 17,533