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Share-Based Compensation - Stock Options (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 86 Months Ended
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Aggregate Intrinsic Value      
Outstanding at the end of the period | $ $ 2,461 $ 2,461 $ 2,461
Exercisable at the end of the period | $ $ 2,432 $ 2,432 $ 2,432
Stock Options      
Number of shares      
Outstanding at the beginning of the period (in shares)   213,866  
Exercised (in shares)   (12,722)  
Outstanding at the end of the period (in shares) 201,144 201,144 201,144
Exercisable at the end of the period (in shares) 155,472 155,472 155,472
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) | $ / shares   $ 61.28  
Exercised (in dollars per share) | $ / shares   31.62  
Outstanding at the end of the period (in dollars per share) | $ / shares $ 63.16 63.16 $ 63.16
Exercisable at the end of the period (in dollars per share) | $ / shares $ 56.07 56.07 $ 56.07
Weighted-average fair value of options granted during the year (in dollars per share) | $ / shares   $ 0.00  
Weighted-Average Remaining Contractual Life      
Outstanding at the end of the period   5 years 7 months 21 days  
Exercisable at the end of the period   4 months 27 days  
2012 plan      
Share-Based Compensation      
Options granted (in shares) 0    
2019 plan      
Share-Based Compensation      
Number of shares registered 1,000,000 1,000,000 1,000,000
2004 plan      
Number of shares      
Granted (in shares)     0
Plan 2004 And 2012 | Incentive stock options      
Share-Based Compensation      
Vesting percentage   25.00%  
Expiration period   10 years  
Plan 2004 And 2012 | Incentive stock options | Maximum      
Share-Based Compensation      
Vesting period   4 years