Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating revenues
Other	$ 12,128	$ 13,666	$ 39,540	$ 38,337
Operating revenues	399,053	398,157	1,053,558	1,044,178
Operating expenses
Purchased power	103,525	106,166	252,948	271,187
Fuel	67,374	67,840	204,271	168,081
Production	48,619	52,558	148,457	165,750
Transmission	42,305	40,291	122,329	122,255
General and administrative	12,978	6,398	35,887	22,923
Depreciation, amortization and depletion	40,590	38,977	116,879	118,620
Coal mining	1,675	637	7,824	637
Other	4,640	3,897	12,154	11,317
Operating expenses	321,706	316,764	900,749	880,770
Operating margins	77,347	81,393	152,809	163,408
Other income
Interest	1,364	1,323	4,156	3,762
Capital credits from cooperatives	1,186	1,272	4,520	5,472
Other	14,314	1,466	16,226	3,609
Total other income	16,864	4,061	24,902	12,843
Interest expense, net of amounts capitalized	38,030	38,377	113,954	115,380
Income tax benefit	(77)	(151)	(231)	(453)
Net margins including noncontrolling interest	56,258	47,228	63,988	61,324
Net income attributable to noncontrolling interest	(1,113)	(830)	(3,239)	(2,454)
Net margins attributable to the Association	55,145	46,398	60,749	58,870
Member electric sales
Operating revenues
Operating revenues	358,586	353,487	942,175	942,916
Non-member electric sales
Operating revenues
Operating revenues	$ 28,339	$ 31,004	$ 71,843	$ 62,925