Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Balance at Dec. 31, 2013	$ 2,129,146	$ 4,069	$ 3,641,936	$ (1,516,859)
Common stock issued for restricted stock and stock options		16	(16)
Equity-based compensation	31,742		31,742
Exercise of stock options	33		33
Common stock withheld for taxes on equity-based compensation	(630)		(630)
Conversion option relating to 3.125% convertible senior notes due 2024, net of allocated costs	464,738		464,738
Net loss	(510,763)			(510,763)
Balance at Dec. 31, 2014	2,114,266	4,085	4,137,803	(2,027,622)
Common stock issued for restricted stock		3	(3)
Equity-based compensation	26,297		26,297
Net loss	(694,426)			(694,426)
Balance at Dec. 31, 2015	1,446,137	4,088	4,164,097	(2,722,048)
Common stock issued for restricted stock		24	(24)
Common stock issued in debt exchange	39,595	300	39,295
Equity-based compensation	16,243		16,243
Net loss	(2,343,309)			(2,343,309)
Balance at Dec. 31, 2016	$ (841,334)	$ 4,412	$ 4,219,611	$ (5,065,357)