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Share-Based Payments - SAR Activity (Details) - Stock option and Stock Appreciation Rights - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Options and SAR      
Outstanding at the beginning of the period (in shares) 5,451,862 4,606,559  
Granted (in shares) 1,055,525 1,370,225  
Exercised (in shares) (266,987) (204,373)  
Forfeited (in shares) (466,324) (320,549)  
Outstanding at the end of the period (in shares) 5,774,076 5,451,862 4,606,559
Vested and expected to vest (in shares) 5,774,076    
Exercisable (in shares) 3,651,824    
Weighted- Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 23.26 $ 23.06  
Granted (in dollars per share) 28.93 23.55  
Exercised (in dollars per share) 18.47 11.47  
Forfeited (in dollars per share) 27.74 29.09  
Outstanding at the end of the period (in dollars per share) 24.15 $ 23.26 $ 23.06
Vested and expected to vest (in dollars per share) 24.15    
Exercisable (in dollars per share) $ 21.29    
Weighted-Average Remaining Contractual Term (in years)      
Outstanding at the end of the period 5 years 11 months 12 days 6 years 3 months 10 days 6 years 7 months 28 days
Vested and expected to vest 5 years 11 months 12 days    
Exercisable 4 years 6 months 10 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding $ 41,530 $ 29,877 $ 27,716
Vested and expected to vest 41,530    
Exercisable $ 37,196