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Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Beginning Unrecognized Tax Benefits	$ 20,240	$ 15,259
Increases related to current tax positions	2,484	7,824
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	(1,434)	(885)
Decrease relating to taxing authority settlements	(856)	(794)
Decreases resulting from a lapse of the applicable statue of limitations	(186)	(896)
Unrecognized Tax Benefits, Foreign Currency Translation (decreases) increases to prior year tax positions	974	268
Ending Unrecognized Tax Benefits	$ 24,090	$ 20,240

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- Definition

The gross amount in unrecognized tax benefits for foreign currency translation increases (decreases) resulting from tax positions taken in prior period tax returns.

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- Definition

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 settlements with taxing authorities.

+ 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)(3)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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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.

+ 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)(2)
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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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-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 lapses of applicable statutes of limitations.

+ 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)(4)
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