Other Current Assets - Components of Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Value added tax receivables	$ 21,273us-gaap_ValueAddedTaxReceivableCurrent	$ 20,445us-gaap_ValueAddedTaxReceivableCurrent
Recoverable income taxes	261us-gaap_IncomeTaxesReceivable	2,465us-gaap_IncomeTaxesReceivable
Derivatives (foreign currency forward contracts)	520us-gaap_DerivativeAssetsCurrent	789us-gaap_DerivativeAssetsCurrent
Prepaid insurance	2,713us-gaap_PrepaidInsurance	4,556us-gaap_PrepaidInsurance
Prepaid and other current assets	12,252us-gaap_OtherPrepaidExpenseCurrent	12,917us-gaap_OtherPrepaidExpenseCurrent
Other current assets	$ 37,019us-gaap_OtherAssetsCurrent	$ 41,172us-gaap_OtherAssetsCurrent

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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Aggregate carrying amount, as of the balance sheet date, of current assets not separately disclosed in the balance sheet. Current assets are expected to be realized or consumed within one year (or the normal operating cycle, if longer).

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Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

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Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of value added taxes due either from customers arising from sales on credit terms, or as previously overpaid to tax authorities. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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