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Stock Based Compensation - Summary of Option Activity (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Weighted Number of Options Outstanding    
Outstanding options, Beginning Balance | shares 1,667,290 1,964,880
Options granted (in shares) | shares 275,977 324,525
Options exercised | shares (177,045) (493,615)
Options canceled/forfeited | shares (6,410) (59,050)
Outstanding options, Ending Balance | shares 1,759,812 1,736,740
Exercisable options, Ending Balance | shares 807,570 622,290
Weighted Average Exercise Price    
Weighted Average Exercise Price, Outstanding options | $ / shares $ 62.52 $ 54.24
Weighted Average Exercise Price, Options granted | $ / shares 93.39 81.27
Weighted Average Exercise Price, Options exercised | $ / shares 49.13 45.61
Weighted Average Exercise Price, Options canceled/forfeited | $ / shares 73.42 60.92
Weighted Average Exercise Price, Outstanding options | $ / shares 68.67 61.52
Weighted Average Exercise Price, Exercisable options | $ / shares $ 59.03 $ 52.78
Weighted Average Remaining Contractual Life    
Weighted Average Remaining Contractual Life, Outstanding options 5 years 1 month 20 days 5 years 5 months 4 days
Weighted Average Remaining Contractual Life, Exercisable options 3 years 9 months 25 days 4 years 10 days
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Options exercised | $ $ 7,639 $ 18,157
Aggregate Intrinsic Value, Outstanding options | $ 29,740 54,515
Aggregate Intrinsic Value, Exercisable options | $ $ 20,054 $ 24,975