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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income (Loss) Per Share                      
Net income (loss) $ (4,998) $ (69,598) $ (32,082) $ (15,533) $ (9,788) $ 5,306 $ (8,386) $ (19,110) $ (122,210) $ (31,978) $ (66,940)
Net income (loss) per share:                      
Basic (in dollars per share) $ (0.13) $ (1.78) $ (0.82) $ (0.40) $ (0.25) $ 0.13 $ (0.21) $ (0.48) $ (3.11) $ (0.80) $ (1.70)
Diluted (in dollars per share) $ (0.13) $ (1.78) $ (0.82) $ (0.40) $ (0.25) $ 0.13 $ (0.21) $ (0.48) $ (3.11) $ (0.80) $ (1.70)
Basic weighted average shares outstanding                 39,340 39,742 39,350
Diluted weighted average shares outstanding                 39,340 39,742 39,350