Income Taxes - Uncertain Tax Positions - Tabular Reconciliation (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]
Unrecognized Tax Benefits, Beginning Balance	$ 12,596us-gaap_UnrecognizedTaxBenefits	$ 12,410us-gaap_UnrecognizedTaxBenefits	$ 12,719us-gaap_UnrecognizedTaxBenefits
Increase (decrease) in Unrecognized Tax Benefits Taken in Prior Periods	(93)	83	0
(Decrease) in unrecognized tax benefits taken in prior periods	0	0	(411)
Increase in Unrecognized Tax Benefits Taken in Current Period	2,678	2,182	1,733
(Decrease) in Unrecognized Tax Benefits Due to Lapse of Statute of Limitations	(2,078)	(2,485)	(1,837)
Increase (Decrease) Due to Foreign Exchange Rates	(1,258)	406	206
Unrecognized Tax Benefits, Ending Balance	$ 11,845us-gaap_UnrecognizedTaxBenefits	$ 12,596us-gaap_UnrecognizedTaxBenefits	$ 12,410us-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

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

+ References

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

+ 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)(1)

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

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

-Publisher FASB

-Name Accounting Standards Codification

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