Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Comprehensive Income
Net margins including noncontrolling interest	$ 41,534	$ 17,871	$ 70,524	$ 38,122
Other comprehensive income (loss):
Unrealized gain on securities available for sale	48	36	94	35
Amortization of actuarial gain on postretirement benefit obligation included in net income	(20)	(23)	(59)	(68)
Other comprehensive income (loss)	28	13	35	(33)
Comprehensive income including noncontrolling interest	41,562	17,884	70,559	38,089
Net comprehensive income attributable to noncontrolling interest	(736)	(132)	(1,409)	(313)
Comprehensive income attributable to the Association	$ 40,826	$ 17,752	$ 69,150	$ 37,776