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Income Taxes (Details 10) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Unrecognized Tax Benefit [Line Items]
Balance at beginning of year	$ 1,052	$ 1,335	$ 788
Increase related to prior year tax positions	384	0	292
Decrease related to prior year tax positions	(641)	(292)	0
Increase related to current year tax positions	0	0	630
Settlements	0	0	(368)
Lapse of statute of limitations	(41)	(2)	(7)
Effect of exchange rate change	0	11	0
Balance at end of year	$ 754	$ 1,052	$ 1,335

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- Definition

Gross amount of increase(decrease) in unrecognized tax benefits resulting from foreign currency translation.

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Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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