Income Taxes - Deferred (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Allowances for doubtful accounts	$ 1,117	$ 1,078
Deferred branch tax benefit	11,763	11,645
Deferred revenue	165	114
NOL credit and other carryovers	294	290
Fixed assets	149	140
Accrued expenses	1,541	1,353
Foreign tax credit	17,887	19,040
Stock compensation	4,265	3,594
Pension	337	449
Interest rate swap	102	510
Intangibles	3,252	1,335
Equity method losses	31,827	26,996
Other deferred tax assets	9	4
Less: Foreign losses valuation allowance	(30,913)	(27,186)
Less: Foreign tax credit valuation allowance	(17,887)	(19,040)
Total deferred tax assets	23,908	20,322
Deferred tax liabilities:
Prepaid expenses	(616)	(535)
Intangibles	(18,303)	(15,506)
Property and equipment	(9,306)	(7,992)
Amortization expense	(18,110)	(15,595)
Total deferred tax liabilities	(46,335)	(39,628)
Net deferred tax liabilities	(22,427)	(19,306)
Classification of deferred tax amounts
Non-current liabilities	$ 22,427	$ 19,306