Income Taxes - Income tax results differed from the amount computed by applying the U.S. statutory income tax rate to income before income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income tax results differed from the amount computed by applying the U.S. statutory income tax rate to income before income taxes
Statutory income tax expense	$ 2,903	$ 3,109	$ 9,298
State tax expense	1,816	2,681	531
Effect of tax rates in foreign jurisdictions	(37)	(623)	219
Change in tax rate			12,064
Financing fees			2,608
Interest expense			(194)
Transaction costs	2,387	1,288	355
Stewardship expense	35	2,397
Valuation allowances	226	2,801	752
Other	277	102	(49)
Total income tax expense	$ 7,607	$ 11,755	$ 25,584