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Stock Compensation - Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Options      
Outstanding at the beginning of period (in shares) 4,677,929    
Granted (in shares) 234,940    
Forfeited or expired (in shares) (436,916)    
Exercised (in shares) (299,435)    
Outstanding at the end of the period (in shares) 4,176,518 4,677,929  
Weighted-Average Exercise Price Per Share      
Outstanding at the beginning of period (in dollars per share) $ 39.31    
Granted (in dollars per share) 61.14    
Forfeited or expired (in dollars per share) 53.95    
Exercised (in dollars per share) 22.15    
Outstanding at the end of the period (in dollars per share) $ 40.24 $ 39.31  
Weighted-Average Remaining Contractual Term (Years)      
Outstanding 5 years 3 months 10 days 6 years 9 months 25 days  
Aggregate Intrinsic Value      
Outstanding $ 18,415 $ 109,054  
Information about the stock option plan      
Number of Options, vested and expected to vest (in shares) 4,176,518    
Number of Options, exercisable (in shares) 3,356,739    
Weighted-Average Exercise Price Per Share, vested and expected to vest (in dollars per share) $ 40.24    
Weighted-Average Exercise Price Per Share, exercisable (in dollars per share) $ 36.96    
Weighted-Average Remaining Contractual Term, vested and expected to vest 5 years 3 months 10 days    
Weighted-Average Remaining Contractual Term, exercisable 4 years 7 months 13 days    
Aggregate Intrinsic Value, vested and expected to vest $ 18,415    
Aggregate Intrinsic Value, exercisable 18,154    
Total intrinsic value of stock options exercised $ 6,300 $ 17,700 $ 12,100