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Stock Compensation - Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of Options      
Outstanding at the beginning of period (in shares) 4,176,518    
Granted (in shares) 797,992    
Forfeited or expired (in shares) (1,268,273)    
Exercised (in shares) (491,700)    
Outstanding at the end of the period (in shares) 3,214,537 4,176,518  
Weighted-Average Exercise Price Per Share      
Outstanding at the beginning of period (in dollars per share) $ 40.24    
Granted (in dollars per share) 27.10    
Forfeited or expired (in dollars per share) 49.33    
Exercised (in dollars per share) 7.65    
Outstanding at the end of the period (in dollars per share) $ 38.38 $ 40.24  
Weighted-Average Remaining Contractual Term (Years)      
Outstanding 4 years 2 months 4 days 5 years 3 months 10 days  
Aggregate Intrinsic Value      
Outstanding $ 0 $ 18,415  
Information about the stock option plan      
Number of Options, exercisable (in shares) 2,580,045    
Weighted-Average Exercise Price Per Share, exercisable (in dollars per share) $ 40.02    
Weighted-Average Remaining Contractual Term, exercisable 3 years 21 days    
Aggregate Intrinsic Value, exercisable $ 0    
Total intrinsic value of stock options exercised $ 4,700 $ 6,300 $ 17,700