Net Income (Loss) Per Common Share - Reconciliation of Basic and Diluted Net Income (Loss) Per Common Share (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
Numerator for basic and diluted net income (loss) per common share:                      
Income (loss) from continuing operations                 $ (194,366) $ (28,126) $ 48,109
Income (loss) from discontinued operations, net of tax $ (132) $ 19,652 $ 11,036 $ (64,127) $ 18,360 $ 18,275 $ 207 $ 17,932 (33,571) 54,774 67,183
Less: Net income attributable to participating securities                 0 0 0
Net income (loss) — used in basic and diluted net income (loss) per common share                 $ (227,937) $ 26,648 $ 115,292
Weighted average common shares outstanding including participating securities (in shares)                 35,489 34,437 34,286
Less: Weighted average participating securities outstanding (in shares)                 (921) (149) 0
Weighted average common shares outstanding — used in basic net income (loss) per common share (in shares)                 34,568 34,288 34,286
Net dilutive potential common shares issuable:                      
On exercise of options and vesting of restricted stock units (in shares)                     0
Weighted average common shares outstanding — used in diluted net income (loss) per common share (in shares)                 34,568 34,288 34,286
Net income (loss) per common share:                      
Basic (in dollars per share) $ (0.77) $ (0.37) $ (2.76) $ (2.70) $ (0.12) $ 0.25 $ (0.42) $ 1.06 $ (6.59) $ 0.78 $ 3.36
Diluted (in dollars per share) $ (0.77) $ (0.37) $ (2.76) $ (2.70) $ (0.12) $ 0.25 $ (0.42) $ 1.06 $ (6.59) $ 0.78 $ 3.36