Consolidated Statement of Equity - USD ($) $ in Thousands	Patronage capital	Accumulated other comprehensive income (loss)	Noncontrolling interest	Total
Equity at beginning of period at Dec. 31, 2014	$ 908,669	$ (828)	$ 109,302
Change in Equity
Net margins attributable to the Association	20,126			$ 20,126
Unrealized loss on securities available for sale		(16)
Reclassification adjustment for actuarial (gain)/loss on postretirement benefit obligation included in net income		9
Net income (loss) attributable to noncontrolling interest			(180)	(180)
Equity at end of period at Mar. 31, 2015	928,795	(835)	109,122	1,037,082
Equity at beginning of period at Dec. 31, 2015	952,082	589	108,757	1,061,428
Change in Equity
Net margins attributable to the Association	17,533			17,533
Unrealized loss on securities available for sale		(22)
Reclassification adjustment for actuarial (gain)/loss on postretirement benefit obligation included in net income		(22)
Net income (loss) attributable to noncontrolling interest			52	52
Equity distribution to noncontrolling interest			(59)
Equity at end of period at Mar. 31, 2016	$ 969,615	$ 545	$ 108,750	$ 1,078,910