Treasury Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 11, 2019	Dec. 31, 2016
Equity [Abstract]
Number of repurchase of shares authorized by board of directors				$ 20,000	$ 20,000
Shares repurchased (in shares)	72	918	234
Purchase of treasury stock	$ 722	$ 12,096	$ 1,492
Commissions to brokers included in cash consideration paid	2	$ 34
Remaining authorized repurchase amount	$ 20,000
Weighted average price per share of stock repurchase (in usd per share)	$ 10.00	$ 13.18