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Income Tax - Income tax expense (benefit) (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
Income Tax Expense (benefit) Attributable To Income From Continuing Operations [Abstract]
Federal and state									$ (191)	$ 253
Foreign, current									279	297
Current Income Tax Expense (Benefit), Total									88	550
Federal and state, deferred tax									(3,552)	(1,730)
Foreign, deferred									(212)	575
Deferred Income Taxes									(3,764)	(1,155)
Income Tax Expense, Total	$ (3,260)	$ (652)	$ (369)	$ 605	$ (464)	$ (19)	$ (115)	$ (7)	(3,676)	(605)
Income Tax Expense (benefit) Attributable To Income From Continuing and discontinued Operations [Abstract]
Continuing operations	$ (3,260)	$ (652)	$ (369)	$ 605	$ (464)	$ (19)	$ (115)	$ (7)	(3,676)	(605)
Discontinued operations									(441)	(617)
Total income tax benefit									$ (4,117)	$ (1,222)

X

- Definition

The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal, state and local tax law to the relevant amounts of taxable Income or Loss from continuing operations.

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The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federal, state and local tax laws.

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Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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Amount of deferred income tax expense (benefit) and income tax credits.

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