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Share-based Compensation and Equity - Summary of Stock Options Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Options      
Outstanding, of period (in shares) 5,388 9,020 9,903
Granted (in shares) 0 698 717
Exercised (in shares) (860) (1,569) 0
Forfeited or expired (in shares) (1,100) (2,761) (1,600)
Outstanding, end of period (in shares) 3,428 5,388 9,020
Exercisable (in shares) 3,292 4,846 7,878
Vested and expected to vest (in shares) 3,426 5,274 8,990
Weighted Average Exercise Price      
Outstanding, beginning of period (in dollars per share) $ 18.18 $ 18.79 $ 19.30
Granted (in dollars per share) 0 14.99 14.27
Exercised (in dollars per share) 17.60 16.95 0
Forfeited or expired (in dollars per share) 19.66 20.06 19.92
Outstanding, end of period (in dollars per share) 17.85 18.18 18.79
Exercisable (in dollars per share) 17.97 18.50 19.11
Vested and expected to vest (in dollars per share) $ 17.85 $ 18.20 $ 18.80
Aggregate Intrinsic Value      
Outstanding, beginning of period $ 3,396 $ 744 $ 0
Exercised 2,353 794 0
Outstanding, end of period 159 3,396 744
Exercisable intrinsic value 159 2,136 265
Vested and expected to vest, intrinsic value $ 159 $ 3,344 $ 722