Condensed Consolidated Statements of Shareholders Equity - 6 months ended Jun. 30, 2015 - 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, 2014	$ 4,967,844	$ 3,720	$ 1,287,941	$ (385)	$ 3,676,568
Balance, shares at Dec. 31, 2014	372,005,502	372,005,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) (unaudited)	$ (131,568)				(131,568)
Other Comprehensive Income (Loss), Net of Tax (unaudited)	(2,480)			(2,480)
Stock-based compensation (unaudited)	27,411		27,411
Restricted stock:
Issued (unaudited)	13	$ 13
Issued (unaudited), shares		1,338,699
Repurchased and canceled (unaudited)	(5,192)	$ (1)	(5,191)
Repurchased and canceled (unaudited), shares		(109,462)
Forfeited (unaudited), shares		(160,647)
Forfeitures (unaudited), value	(1)	$ (1)
Balance at Jun. 30, 2015	$ 4,856,027	$ 3,731	$ 1,310,161	$ (2,865)	$ 3,545,000
Balance, shares at Jun. 30, 2015	373,074,092	373,074,092