Income Taxes - Deferred (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowances for doubtful accounts	$ 1,078	$ 776
Deferred branch tax benefit	11,645	11,813
Deferred revenue	114	109
NOL credit and other carryovers	290	274
Fixed assets	140	94
Accrued expenses	1,353	1,455
Foreign tax credit	19,040	18,497
Stock compensation	3,594	3,634
Pension	449	360
Interest rate swap	510	178
Intangibles	1,335	1,354
Equity method losses	26,996	21,976
Other deferred tax assets	4	38
Less: Foreign income valuation allowance	(27,186)	(22,570)
Less: Foreign tax credit valuation allowance	(19,040)	(18,497)
Deferred tax assets, gross	20,322	19,491
Deferred tax liabilities:
Prepaid expenses	(535)	(504)
Intangibles	(15,506)	(15,496)
Property and equipment	(7,992)	(8,225)
Amortization expense	(15,595)	(13,389)
Total deferred tax liabilities	(39,628)	(37,614)
Net deferred tax liabilities	(19,306)	(18,123)
Classification of deferred tax amounts
Non-current assets		1,208
Non-current liabilities	$ 19,306	$ 19,331