Treasury Stock (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	Nov. 06, 2019	Mar. 31, 2020	Mar. 31, 2019
Treasury Stock
Common stock acquired, cost		$ 60,737	$ 10,000
Common stock repurchase authorization
Treasury Stock
Authorization amount for repurchase of common stock		$ 250,000
Common stock acquired, shares	100	787
Common stock acquired, cost	$ 7,297	$ 60,737
Remaining authorized repurchase amount		$ 66,580