Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Consolidated Statements of Comprehensive Income
Net margins including noncontrolling interest	$ (3,291)	$ 8,006
Other comprehensive income (loss):
Amortization of actuarial (gain) loss on postretirement benefit obligation included in net margin	933	33
Unrecognized prior service cost	(7,373)	(214)
Other comprehensive income (loss)	(6,440)	(181)
Comprehensive income including noncontrolling interest	(9,731)	7,825
Net comprehensive income attributable to noncontrolling interest	(1,319)	(1,017)
Comprehensive income attributable to the Association	$ (11,050)	$ 6,808