Stock Repurchase Plan - Repurchase Activity (Details) - USD ($)	12 Months Ended		40 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2019	May 31, 2016
Equity [Abstract]
Total number of stock repurchased	1,335,584	0	988,767
Total value of shares repurchased	$ 35.83		$ 30.30
Total remaining authorized repurchase amount	$ 47,900,000
Total authorized repurchase amount		$ 80,000,000.0		$ 30,000,000.0
Total value of stock repurchased	55,300,000
Total remaining authorized repurchase amount	$ 24,700,000