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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($)
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
Numerator (for basic and diluted earnings per share)                      
Net income (loss) from continuing operations $ 11,460 $ (27,604) $ 6,855 $ (2,733) $ 36,299 $ 10,976 $ 9,060 $ 3,587 $ (12,022) $ 59,922 $ (73,872)
Loss attributable to noncontrolling interest $ (1,511) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 1,511 0 0
Income allocated to RSUs                 0 (817) 0
Net income (loss)                 $ (10,511) $ 59,105 $ (73,872)
Denominator                      
Basic weighted-average shares outstanding 81,792 82,039 82,302 82,079 82,401 83,230 83,773 83,965 82,052 83,339 77,373
Effect of dilutive securities:                      
Stock options held by employees and directors                 0 300 0
Diluted weighted-average shares outstanding 81,792 82,039 82,465 82,079 82,684 83,518 84,051 84,225 82,052 83,639 77,373
Anti-dilutive securities [1]                 1,220 0 1,907
[1] Amount outstanding at balance sheet date, before application of the treasury stock method and not weighted for period outstanding.