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Derivative Instruments (Schedule Of Derivative Instruments, Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | $ 5,069 | $ (584)
Derivatives Designated As Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | 5,069 | 7,422
Derivatives Designated As Hedging Instruments [Member] | Forward Contracts [Member] | Other Receivables [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | 454 | 857
Derivatives Designated As Hedging Instruments [Member] | Cross-Currency Interest Rate Swaps [Member] | Derivative Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | 4,615 | 6,565
Derivative fair value of non-current asset | 6,741 | 9,517
Derivative fair value of current liability | 2,126 | 2,952
Derivatives Not Designated As Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | 0 | (8,006)
Derivatives Not Designated As Hedging Instruments [Member] | Total Equity Return Swap [Member] | Derivative Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Assets (Liabilities) Derivative, Fair Value | $ 0 | $ (8,006)

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