Earnings Per Share - Calculation of Basic and Diluted Weighted Average Shares Outstanding and Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic:
Net loss	$ (89,635)	$ (291,965)	$ (474,180)	$ (772,259)
Net income attributable to participating securities	0	0	0	0
Net loss attributable to common stock - basic	(89,635)	(291,965)	(474,180)	(772,259)
Diluted:
Net loss	(89,635)	(291,965)	(474,180)	(772,259)
Net income attributable to participating securities	0	0	0	0
Net loss attributable to common stock - diluted	$ (89,635)	$ (291,965)	$ (474,180)	$ (772,259)
Weighted average shares (denominator):
Weighted average shares - basic (in shares)	5,600	5,528	5,585	5,523
Dilutive effect of stock options (in shares)	0	0	0	0
Dilutive effect of convertible notes (in shares)	0	0	0	0
Weighted average shares - diluted (in shares)	5,600	5,528	5,585	5,523
Basic loss per share (in usd per share)	$ (16.01)	$ (52.82)	$ (84.90)	$ (139.83)
Diluted loss per share (in usd per share)	$ (16.01)	$ (52.82)	$ (84.90)	$ (139.83)