Earnings (Loss) Per Share - Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Class of Stock [Line Items]
Net income (loss) - Basic and Diluted	$ (12,547)	$ 11,041	$ (14,062)	$ 23,058
Weighted average common shares outstanding - Basic	54,264	54,645	54,356	54,299
Assumed conversions:
Incremental common shares from warrants	0	0	0	243
Weighted average common shares outstanding - Diluted	54,264	55,533	54,356	55,473
Basic earnings (loss) per common share (in dollars per share)	$ (0.23)	$ 0.20	$ (0.26)	$ 0.42
Diluted earnings (loss) per common share (in dollars per share)	$ (0.23)	$ 0.20	$ (0.26)	$ 0.42
Stock Options [Member]
Assumed conversions:
Incremental common shares from stock options and restricted stock units	0	878	0	916
Restricted Stock Units [Member]
Assumed conversions:
Incremental common shares from stock options and restricted stock units	0	10	0	15