Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Consolidated Statements of Comprehensive Income
Net margins including noncontrolling interest	$ 46,253	$ 56,258	$ 49,816	$ 63,988
Other comprehensive loss:
Amortization of actuarial (gain) loss on postretirement benefit obligation included in net margin	177	(10)	1,287	13
Unrecognized prior service cost			(7,373)	(214)
Other comprehensive loss	177	(10)	(6,086)	(201)
Comprehensive income including noncontrolling interest	46,430	56,248	43,730	63,787
Net comprehensive income attributable to noncontrolling interest	(1,424)	(1,113)	(4,164)	(3,239)
Comprehensive income attributable to the Association	$ 45,006	$ 55,135	$ 39,566	$ 60,548