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Supplemental financial statement info Components of Prepaid and Other Current Assets (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Prepaid and other assets	$ 19,601us-gaap_PrepaidExpenseCurrent	$ 15,051us-gaap_PrepaidExpenseCurrent
Income/withholding tax receivable – current	5,389us-gaap_IncomeTaxesReceivable	11,437us-gaap_IncomeTaxesReceivable
VAT receivable	4,778us-gaap_ValueAddedTaxReceivableCurrent	5,648us-gaap_ValueAddedTaxReceivableCurrent
Derivative assets	0us-gaap_DerivativeAssetsCurrent	140us-gaap_DerivativeAssetsCurrent
Total Prepaid and other current assets	$ 29,768us-gaap_PrepaidExpenseAndOtherAssetsCurrent	$ 32,276us-gaap_PrepaidExpenseAndOtherAssetsCurrent

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- Definition

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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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that 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 costs that provide 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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