Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective income tax rate reconciliation
Income taxes at 21% statutory tax rate	$ 15,780	$ 14,739	$ 39,548
Profit of non-controlling interest not subject to U.S. federal tax	(3,754)	(5,508)	(15,477)
Foreign income taxes (net of foreign tax credit)	2,423	269	364
State income taxes (excluding rate change)	1,348	883	4,887
Impact of change in forecasted state income tax rate	1,347	(1,216)	5,774
Foreign withholding taxes	730	462	988
Change in valuation allowance	(8,977)	2,840	(3,888)
Adjustments of prior year taxes	79	(1,663)	1,336
Stock compensation	(1,096)	(34)	(762)
Other	(205)	198	(750)
Total provision for income taxes	$ 7,675	$ 10,970	$ 32,020