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, 2015	$ 952,082	$ 589	$ 108,757
Change in Equity
Net margins attributable to the Association	17,533			$ 17,533
Unrealized gain (loss) on securities available for sale		(22)
Amortization of actuarial gain on postretirement benefit obligation included in net income		(22)
Net income 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
Equity at beginning of period at Dec. 31, 2016	961,364	(286)	109,147	1,070,225
Change in Equity
Net margins attributable to the Association	23,526			23,526
Unrealized gain (loss) on securities available for sale		24
Amortization of actuarial gain on postretirement benefit obligation included in net income		(20)
Net income attributable to noncontrolling interest			296	296
Equity at end of period at Mar. 31, 2017	$ 984,890	$ (282)	$ 109,443	$ 1,094,051