Income Taxes - Effective Income Tax (Benefit) Expense Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Statutory amount	$ 4,662	$ (733)	$ (22,398)
Valuation allowance on foreign tax credits	1,344	1,081	593
State income tax, net of federal benefit	792	991	(1,922)
Permanent differences, other	558	461	1,550
Permanent differences, stock compensation	328	311	(24)
Valuation allowance, other	(5,795)	(166)	10,384
Other	87	(77)	(416)
Consolidated income tax provision	$ 1,976	$ 1,868	$ (12,233)
Consolidated effective tax rate	8.90%	(53.50%)	11.50%