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Income Tax - Reconciliation of uncertain tax liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation Of Uncertain Tax Liabilities [abstract]
Beginning Balance	$ 323	$ 406
Release due to expiration of statute of limitations	(94)
Additions based on tax positions of prior years	242
Additions based on tax positions of acquired entities	1,389
Decreases based on tax positions of prior years		(53)
Settlements		(30)
Ending Balance	$ 1,860	$ 323

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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