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Income (Loss) Per Share - Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income (Loss) Per Share                      
Net income (loss) $ (5,616) $ (21,884) $ (18,388) $ 1,095 $ (4,998) $ (69,598) $ (32,082) $ (15,533) $ (44,793) $ (122,210) $ (31,978)
Net income (loss) per common share:                      
Basic (in dollars per share) $ (0.12) $ (0.47) $ (0.43) $ 0.03 $ (0.13) $ (1.78) $ (0.82) $ (0.40) $ (1.01) $ (3.11) $ (0.80)
Diluted (in dollars per share) $ (0.12) $ (0.47) $ (0.43) $ 0.03 $ (0.13) $ (1.78) $ (0.82) $ (0.40) $ (1.01) $ (3.11) $ (0.80)
Basic weighted average shares outstanding                 44,174 39,340 39,742
Diluted weighted average shares outstanding                 44,174 39,340 39,742