Unaudited Interim Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings / (Accumulated Deficit)	Accumulated Other Comprehensive Income (Loss)	Total Equity
Beginning Balance at Dec. 31, 2015		$ 2,500	$ 901,422	$ 396,830	$ 46,166	$ 1,346,918
Comprehensive income:
Net income (loss)	$ (142,665)			(142,665)		(142,665)
Other comprehensive income (loss), net of tax	17,989				17,989	17,989
Total comprehensive income (loss)						(124,676)
Ending Balance at Mar. 31, 2016		2,500	901,422	254,165	64,155	1,222,242
Beginning Balance at Dec. 31, 2016		2,500	8,095,436	(693,258)	(314,948)	7,089,730
Comprehensive income:
Net income (loss)	262,358			262,358		262,358
Other comprehensive income (loss), net of tax	$ 35,332				35,332	35,332
Total comprehensive income (loss)						297,690
Ending Balance at Mar. 31, 2017		$ 2,500	$ 8,095,436	$ (430,900)	$ (279,616)	$ 7,387,420