Stock Compensation - ESPP (Details) - Employee stock purchase plan	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, Beginning balance (in shares) | shares	229,836
Granted (in shares) | shares	742,819
Exercised (in shares) | shares	(798,806)
Options outstanding, Ending balance (in shares) | shares	173,849
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-average exercise price, Outstanding, Beginning of period (in dollars per share) | $ / shares	$ 80.29
Weighted-average exercise price, Granted (in dollars per share) | $ / shares	102.34
Weighted-average exercise price, Exercised (in dollars per share) | $ / shares	94.30
Weighted-average exercise price, Outstanding, End of period (in dollars per share) | $ / shares	$ 110.14