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Earnings (Loss) Per Share (Basic and Diluted Earnings (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Net income (loss) attributable to common stockholders                 $ (13,462) $ 53,603 $ 36,178
Weighted average common shares outstanding - Basic                 54,459 54,511 51,346
Assumed conversions:                      
Incremental common shares from warrants                 0 121 1,355
Incremental common shares from stock options                 0 880 1,133
Incremental common shares from restricted stock units                 0 14 7
Weighted average common shares outstanding - Diluted                 54,459 55,526 53,841
Basic earnings (loss) per common share (in dollars per share) $ (0.03) $ 0.04 $ (0.23) $ (0.03) $ 0.30 $ 0.26 $ 0.20 $ 0.22 $ (0.25) $ 0.98 $ 0.70
Diluted earnings (loss) per common share (in dollars per share) $ (0.03) $ 0.04 $ (0.23) $ (0.03) $ 0.29 $ 0.26 $ 0.20 $ 0.22 $ (0.25) $ 0.97 $ 0.67