Earnings (Loss) Per Share - Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Class of Stock [Line Items]
Net income (loss) - Basic and Diluted	$ 1,975	$ 14,272	$ (12,087)	$ 37,330
Weighted average common shares outstanding - Basic	54,578	54,789	54,430	54,464
Assumed conversions:
Incremental common shares from warrants	0	0	0	162
Weighted average common shares outstanding - Diluted	54,947	55,690	54,430	55,536
Basic earnings (loss) per common share (in dollars per share)	$ 0.04	$ 0.26	$ (0.22)	$ 0.69
Diluted earnings (loss) per common share (in dollars per share)	$ 0.04	$ 0.26	$ (0.22)	$ 0.67
Stock Options [Member]
Assumed conversions:
Incremental common shares from stock options and restricted stock units	345	867	0	901
Restricted Stock Units [Member]
Assumed conversions:
Incremental common shares from stock options and restricted stock units	24	34	0	9