Stock Plans - Summary of Restricted Stock and Unit Activity (Details)	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Performance Shares
Shares
Unvested, beginning balance (in shares) | shares	200,212
Granted (in shares) | shares	46,070
Vested (in shares) | shares	(63,286)
Unvested, ending balance (in shares) | shares	187,937
Weighted Average Exercise Price (dollars per share)
Unvested, beginning balance (dollars per share) | $ / shares	$ 104.69
Granted (dollars per share) | $ / shares	177.32
Vested (dollars per share) | $ / shares	84.97
Unvested, ending Balance (dollars per share) | $ / shares	$ 128.72
Restricted Stock Activity
Shares
Unvested, beginning balance (in shares) | shares	146,191
Granted (in shares) | shares	28,128
Vested (in shares) | shares	(29,981)
Forfeited (in shares) | shares	(156)
Unvested, ending balance (in shares) | shares	144,182
Weighted Average Exercise Price (dollars per share)
Unvested, beginning balance (dollars per share) | $ / shares	$ 105.83
Granted (dollars per share) | $ / shares	170.69
Vested (dollars per share) | $ / shares	85.89
Forfeited (dollars per share) | $ / shares	121.83
Unvested, ending Balance (dollars per share) | $ / shares	$ 122.62