Condensed Consolidated Statements of Shareholders Equity - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2015	$ 4,668,900	$ 3,730	$ 1,345,624	$ (3,354)	$ 3,322,900
Balance, shares at Dec. 31, 2015	372,959,080	372,959,080
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) (unaudited)	$ (317,727)				(317,727)
Other Comprehensive Income (Loss), Net of Tax (unaudited)	451			451
Stock-based compensation (unaudited)	21,041		21,041
Restricted stock:
Granted (unaudited)	$ 20	$ 20
Granted (unaudited), shares	2,007,078	2,007,078
Repurchased and canceled (unaudited)	$ (5,735)	$ (3)	(5,732)
Repurchased and canceled (unaudited), shares	(279,019)	(279,019)
Forfeited (unaudited), shares	(105,835)	(105,835)
Forfeitures (unaudited)	$ (1)	$ (1)
Balance at Jun. 30, 2016	$ 4,366,949	$ 3,746	$ 1,360,933	$ (2,903)	$ 3,005,173
Balance, shares at Jun. 30, 2016	374,581,304	374,581,304