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Share-Based Compensation - Stock Options (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 5 Months Ended 26 Months Ended 110 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2021
USD ($)
$ / shares
shares
2004 plan        
Additional disclosures        
Granted (in shares)       0
2012 plan        
Additional disclosures        
Granted (in shares)     0  
2019 plan        
Additional disclosures        
Granted (in shares)   0    
2020 plan        
Share-Based Compensation        
Number of shares registered 2,072,245 2,072,245 2,072,245 2,072,245
Stock Options        
Share-Based Compensation        
Vesting percentage 25.00%      
Vesting period 4 years      
Expiration period 10 years      
Number of shares        
Outstanding at the beginning of the period (in shares) 256,425      
Exercised (in shares) (37,854)      
Outstanding at the end of the period (in shares) 218,571 218,571 218,571 218,571
Exercisable at the end of the period (in shares) 218,571 218,571 218,571 218,571
Weighted-Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) | $ / shares $ 59.01      
Exercised (in dollars per share) | $ / shares 46.81      
Outstanding at the end of the period (in dollars per share) | $ / shares 61.13 $ 61.13 $ 61.13 $ 61.13
Exercisable at the end of the period (in dollars per share) | $ / shares $ 61.13 $ 61.13 $ 61.13 $ 61.13
Weighted-Average Remaining Contractual Life        
Outstanding at the end of the period 4 years 6 months 7 days      
Exercisable at the end of the period 4 years 6 months 7 days      
Aggregate Intrinsic Value        
Outstanding at the end of the period | $ $ 4,584 $ 4,584 $ 4,584 $ 4,584
Exercisable at the end of the period | $ $ 4,584 4,584 4,584 4,584
Additional disclosures        
Granted (in shares) 0      
Total unrecognized compensation cost related to non vested stock option grants | $ $ 0 $ 0 $ 0 $ 0