Condensed Consolidated Statements of Shareholders Equity (USD $) In Thousands, except Share data, unless otherwise specified	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)	(131,971)				(131,971)
Other Comprehensive Income (Loss), Net of Tax (unaudited)	(3,105)			(3,105)
Stock-based compensation (unaudited)	11,261		11,261
Restricted stock:
Issued (unaudited)	12	12
Issued (unaudited), shares		1,233,574
Repurchased and canceled (unaudited)	(3,003)	(1)	(3,002)
Repurchased and canceled (unaudited), shares		(63,446)
Forfeited (unaudited), shares		(54,576)
Forfeitures (unaudited), value	0
Balance at Mar. 31, 2015	$ 4,841,038	$ 3,731	$ 1,296,200	$ (3,490)	$ 3,544,597
Balance, shares at Mar. 31, 2015	373,121,054	373,121,054