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Stock Based Compensation - Summary of Option Activity (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Weighted Number of Options Outstanding    
Outstanding options, Beginning Balance | shares 1,632,334  
Options granted (in shares) | shares 44,496  
Options exercised | shares (121,645)  
Options canceled/forfeited | shares (600)  
Outstanding options, Ending Balance | shares 1,554,585  
Exercisable options, Ending Balance | shares 563,215  
Weighted Average Exercise Price    
Weighted Average Exercise Price, Outstanding options, Beginning Balance | $ / shares $ 70.67  
Weighted Average Exercise Price, Options granted | $ / shares 97.64  
Weighted Average Exercise Price, Options exercised | $ / shares 56.04  
Weighted Average Exercise Price, Options canceled/forfeited | $ / shares 93.24  
Weighted Average Exercise Price, Outstanding options, Ending Balance | $ / shares 72.57  
Weighted Average Exercise Price, Exercisable options | $ / shares $ 61.80  
Weighted Average Remaining Contractual Life    
Weighted Average Remaining Contractual Life, Outstanding options 5 years 2 months 1 day  
Weighted Average Remaining Contractual Life, Exercisable options 3 years 9 months  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Options exercised | $ $ 6,900 $ 2,500
Aggregate Intrinsic Value, Outstanding options | $ 60,622  
Aggregate Intrinsic Value, Exercisable options | $ $ 28,029