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Derivative Instruments (Schedule of Derivative Instruments, Fair Value) (Details) - Derivatives Designated As Hedging Instruments [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | $ (30,591) | $ 5,069
Forward Contracts [Member] | Other Receivables [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | 0 | 454
Forward Contracts [Member] | Accrued Payroll and Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | (100) | 0
Cross-Currency Interest Rate Swaps [Member] | Derivative Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative fair value of non-current asset | 10,615 | 6,741
Derivative fair value of current liability | 19,876 | 2,126
2013 Cross-Currency Interest Rate Swap [Member] | Derivative Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | (3,274) | 4,615
2016 Cross-Currency Interest Rate Swap [Member] | Derivative Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | $ (27,217) | $ 0

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