Income Taxes - Unrecognized Tax Liability (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 10,833us-gaap_UnrecognizedTaxBenefits	$ 9,851us-gaap_UnrecognizedTaxBenefits
Additions to:
Positions taken during the current year	348	942
Positions taken during a prior year	418	55
Unrecognized Tax Benefits, Increases Resulting from Exchange Rate Impact	0	313
Deductions due to:
Exchange rate impact	(362)	0
Settlements with taxing authorities	0	(36)
Lapse of statute of limitations	(218)	(292)
Balance at end of year	$ 11,019us-gaap_UnrecognizedTaxBenefits	$ 10,833us-gaap_UnrecognizedTaxBenefits

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

+ References

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

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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 foreign currency translation.

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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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