Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended		12 Months Ended
	Feb. 27, 2020	Aug. 17, 2017	Feb. 19, 2020	Jan. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsequent Events
Payments for Repurchase of Common Stock					$ 22,003	$ 20,598	$ 10,000
Subsequent event
Subsequent Events
Dividend declared (per share)	$ 0.05
Current office lease to extend			true
Lease term			13 months
Shares repurchased				127,269
Shares repurchased, weighted average price (in dollars per share)				$ 6.830
Payments for Repurchase of Common Stock				$ 900
Series B Participating Preferred Stock
Subsequent Events
Preference dividend (as a percent)		6.00%
Series B Participating Preferred Stock | Subsequent event
Subsequent Events
Dividend declared (per share)	$ 0.375
Preference dividend (as a percent)	6.00%