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Income Taxes - (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) subsidiary	Dec. 31, 2017
Income Taxes
Deferred tax assets	$ 0
Statutory federal income tax rate (as a percent)	21.00%	35.00%
Unrecognized tax benefits interest and penalties	$ 0
Unrecognized tax benefits accrued interest and penalties	$ 0
Number of partially owned subsidiaries | subsidiary	2
Federal income tax benefit or expense	$ 0

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- Definition

Represents the number of partially owned subsidiaries by the entity.

+ References

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- Definition

Amount of undistributed earnings of foreign subsidiaries for deferred tax liabilities not recognized as of the report date.

+ References

No definition available.

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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