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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