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Stock-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
LTIP NQSOs | Stock Incentive Plan 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares)     0  
Annual RSUs | Stock Incentive Plan 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)     3 years  
Granted (in shares)     44,702 60,000
Weighted-average grant date fair value (in dollars per share)     $ 171.72 $ 115.80
Annual PSUs | Stock Incentive Plan 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)     3 years  
Granted (in shares)     19,509 31,320
Weighted-average grant date fair value (in dollars per share)     $ 174.34 $ 116.34
Annual RSUs and Annual PSUs | Stock Incentive Plan 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock compensation expense   $ 12,149 $ 12,149  
Granted (in shares)     64,211 91,320
Weighted-average grant date fair value (in dollars per share)     $ 172.51 $ 115.98
LTIP PSUs | 2015 SIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized stock compensation expense   $ 8,914 $ 8,914  
2007 LTIP SARs | Stock Incentive Plan 2015        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     0  
2020 | LTIP PSUs | 2015 SIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years) 3 years      
Award requisite service period 36 months      
Granted (in shares)   38,174    
Weighted-average grant date fair value (in dollars per share)   $ 146.96    
2020 | Maximum | LTIP PSUs | 2015 SIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rights percentage 200.00%      
2020 | Minimum | LTIP PSUs | 2015 SIP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Financial performance achievement percentage 90.00%