Income Taxes - Effective Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of income before income taxes
Domestic income		$ 9,984	$ 10,997	$ 9,663
Foreign (loss) income		(4,714)	17,375	13,118
Income before income tax expense		5,270	28,372	22,781
Composition of income tax expense
Current income tax expense		4,233	15,801	11,880
Deferred income tax (benefit)		14,473	(5,429)	(2,838)
Income tax expense		18,706	10,372	9,042
Foreign withholding tax included in current tax expense		$ 1,500	$ 1,700	$ 1,500
Effective tax rates reconciliation
Pre-tax book income - US Only (as a percent)		35.00%	35.00%	35.00%
Pre-tax book income - Foreign Only (as a percent)		31.30%	21.40%	20.20%
Permanent items (as a percent)		15.70%	3.20%	4.00%
Return to provision true-ups - Current/Deferred (as percent)		(4.20%)	(1.10%)	(1.40%)
Foreign rate differential (as a percent)		6.60%	2.40%	2.20%
Foreign tax credits (as a percent)		(51.70%)	(32.00%)	(24.50%)
Foreign valuation allowance		59.00%
Change in FTC valuation allowance due to tax reform		200.00%
Tax Cut and Jobs Act Law Changes		56.20%
Foreign withholding taxes (as a percent)		29.00%	6.00%	6.70%
Deferred foreign tax credit offset (as a percent)		(21.90%)	0.00%	(2.20%)
State taxes and state rate change (as a percent)		1.10%	1.40%	(0.30%)
UTP adjustment		(2.60%)	0.30%	0.00%
Effective tax rate (as a percent)		353.50%	36.60%	39.70%
Effect of Tax Cuts And Jobs Act 2017
Income tax expense due to remeasurement of deferred tax asset		$ 3,000
Scenario, Forecast
Effective tax rates reconciliation
Pre-tax book income - US Only (as a percent)	21.00%
Colombian content producers, Radio television and NTC nacional
Effect of Tax Cuts And Jobs Act 2017
Foreign income valuation allowance		3,117
Puerto Rico And Latin America
Effect of Tax Cuts And Jobs Act 2017
Foreign tax credit valuation allowance		$ 10,588