Income Taxes - Effective Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of income before income taxes
Domestic income	$ 8,112	$ 21,695
Foreign loss	(1,258)	(13,080)
Income before income tax expense	6,854	8,615
Income tax expense
Current income tax expense	7,405	8,493
Deferred income tax	1,587	3,593
Income tax expense	8,992	12,086
Foreign withholding tax included in current tax expense	$ 1,300	$ 1,400
Effective tax rates reconciliation
Statutory federal income tax rate (as a percent)	21.00%	21.00%	21.00%	35.00%
Equity investment and Colombia and return to provision adjustments (as a percent)		30.00%
Income tax (benefit) expense reconciliation
Net tax payable	$ 2,233
Income tax expense at federal statutory rate - US Only	1,439	$ 1,810
Income tax expense at federal statutory rate - Foreign Only	4,402	3,637
Permanent Items	1,325	184
Return to provision true ups - Current/Deferred	(2,042)	301
Foreign rate differential	(1,117)	(2,284)
Foreign tax credits	(5,693)	(5,501)
Foreign valuation allowance	4,615	10,007
Change in FTC valuation allowance	543	3,785
Foreign withholding taxes	1,283	1,449
Deferred foreign tax credit offset	29	(421)
State taxes and state rate change	2,073	480
Foreign rate tax change	2,051
Income tax expense	8,992	12,086
Foreign tax authority | Puerto Rico
Income tax (benefit) expense reconciliation
Net tax payable		1,000
Net refund benefit as an impact of tax incentives		3,000
Revaluation of Puerto Rico deferred taxes	$ 84	$ (1,361)