Income Taxes - Unrecognized Tax Benefit (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of January 1	$ 7,492us-gaap_UnrecognizedTaxBenefits	$ 7,181us-gaap_UnrecognizedTaxBenefits	$ 13,244us-gaap_UnrecognizedTaxBenefits
Gross (decreases) increases—tax positions in prior period due to settlements	(286)	(446)	(5,117)
Gross (decreases) increases—tax positions in prior period-other	100	867	(170)
Gross decreases—related to lapse in statute of limitations	(251)	(1,004)	(1,154)
Gross increases—tax positions in current period	911	820	236
Currency effects	(464)	74	142
Balance at December 31	$ 7,502us-gaap_UnrecognizedTaxBenefits	$ 7,492us-gaap_UnrecognizedTaxBenefits	$ 7,181us-gaap_UnrecognizedTaxBenefits

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

-URI http://asc.fasb.org/extlink&oid=6527854

Reference 2: 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=6907707&loc=SL6600010-109319

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- Definition

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)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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- Definition

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)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319

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- Definition

Unrecognized Tax Benefits, Increases (Decreases) Resulting from Foreign Currency Translation

+ References

No definition available.

+ Details

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- Definition

Unrecognized Tax Benefits, Increases (Decreases) Resulting from Prior Period Tax Positions

+ References

No definition available.

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- Definition

Unrecognized Tax Benefits, Increases (Decreases) Resulting from Settlements with Taxing Authorities

+ References

No definition available.

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