Condensed Consolidated Statements of Shareholders Equity - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive 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 loss (unaudited)	$ (427,348)				(427,348)
Other Comprehensive Income (Loss), Net of Tax (unaudited)	869			869
Stock-based compensation (unaudited)	34,259		34,259
Adjustments to Additional Paid in Capital, Income Tax Deficiency from Share-based Compensation	(9,460)		(9,460)
Restricted stock:
Granted (unaudited)	$ 20	$ 20
Granted (unaudited), shares	2,025,885	2,025,885
Repurchased and canceled (unaudited)	$ (6,540)	$ (3)	(6,537)
Repurchased and canceled (unaudited), shares	(296,105)	(296,105)
Forfeited (unaudited), shares	(151,437)	(151,437)
Forfeitures (unaudited)	$ (2)	$ (2)
Balance at Sep. 30, 2016	$ 4,260,698	$ 3,745	$ 1,363,886	$ (2,485)	$ 2,895,552
Balance, shares at Sep. 30, 2016	374,537,423	374,537,423