Stock-Based Compensation - Restricted Stock Activity and Incentive Stock Awards Activity (Details)	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Weighted Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 73.80
Granted (in dollars per share) | $ / shares	81.10
Vested (in dollars per share) | $ / shares	71.55
Adjustment for incentive stock awards expected to vest (in dollars per share) | $ / shares	74.39
Canceled (in dollars per share) | $ / shares	74.91
Outstanding, end of period (in dollars per share) | $ / shares	$ 77.41
Restricted Stock and Units
Number of Shares
Outstanding, beginning of period (in shares)	656,006
Granted (in shares)	201,126
Vested (in shares)	(297,461)
Adjustment for incentive stock awards expected to vest (in shares)	0
Canceled (in shares)	(22,187)
Outstanding, end of period (in shares)	537,484
Incentive Stock Units
Number of Shares
Outstanding, beginning of period (in shares)	270,645
Granted (in shares)	241,467
Vested (in shares)	(37,672)
Adjustment for incentive stock awards expected to vest (in shares)	119,657
Canceled (in shares)	(23,723)
Outstanding, end of period (in shares)	570,374