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Income (Loss) Per Common Share - Basic and Diluted EPS (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
Income (Loss) Per Common Share                      
Net income (loss) $ (9,788) $ 5,306 $ (8,386) $ (19,110) $ (56,912) $ (13,977) $ (15,211) $ 19,160 $ (31,978) $ (66,940) $ (42,263)
Net income (loss) per common share:                      
Basic (in dollars per share) $ (0.25) $ 0.13 $ (0.21) $ (0.48) $ (1.44) $ (0.35) $ (0.39) $ 0.49 $ (0.80) $ (1.70) $ (1.09)
Diluted (in dollars per share) $ (0.25) $ 0.13 $ (0.21) $ (0.48) $ (1.44) $ (0.35) $ (0.39) $ 0.48 $ (0.80) $ (1.70) $ (1.09)
Basic weighted average shares outstanding                 39,742 39,350 38,807
Diluted weighted average shares outstanding                 39,742 39,350 38,807