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Income Taxes - Statutory Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes
Statutory tax rate percentage									21.00%	35.00%	34.00%
Reconciliation of statutory tax and provision
Expected tax at statutory rate									$ 747	$ 2,933	$ 3,884
Foreign taxes at other rates									(1,308)	(3,139)	(7,512)
US tax on foreign earnings, net of foreign tax credits										(226)	(405)
Valuation reserves on NOL carryforwards									2,894	3,997	3,816
US tax reform - deemed repatriation									(2,534)	18,472
US tax reform - changes in indefinite reinvestment assertion										7,281
US tax reform - deferred tax expense from tax rate change									(462)	2,339
State income taxes, net of federal benefit									(79)	(59)	83
Disallowed expenses and other									449	(818)	997
Total	$ 650	$ (1,702)	$ (872)	$ 629	$ 27,786	$ 2,558	$ 313	$ 233	$ (293)	$ 30,780	$ 863

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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