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Hedging Instruments (Schedule of Fair Values and Balance Sheet Classifications of Derivatives and Non-derivatives Designated as Hedging Instruments) (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Derivatives, Fair Value [Line Items] |  |
Hedging Assets, Total derivative instruments presented as cash flow hedges on the balance sheet | $ 9,952 | $ 477
Hedging Assets, Gross amounts subject to master netting arrangements not offset on the balance sheet | 603 | 477
Hedging Assets, Net amount | 9,349 | 0
Hedging Liabilities, Total hedging instruments presented on the balance sheet | 102,380 | 113,035
Hedging Liabilities, Gross amounts subject to master netting arrangements not offset on the balance sheet | 603 | 477
Hedging Liabilities, Net amount | 101,777 | 112,558
Cash Flow Hedges |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Liabilities, Total hedging instruments presented on the balance sheet | 603 | 6,468
Foreign currency exchange contracts | Other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Assets, Total derivative instruments presented as cash flow hedges on the balance sheet | 8,163 | 477
Foreign currency exchange contracts | Accrued liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Liabilities, Total hedging instruments presented on the balance sheet | 603 | 6,468
Cross currency swaps | Other long-term assets |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Assets, Total derivative instruments presented as cash flow hedges on the balance sheet | 1,789 | 0
Foreign currency denominated debt | Long-term debt |  |
Derivatives, Fair Value [Line Items] |  |
Hedging Liabilities, Total hedging instruments presented on the balance sheet | $ 101,777 | $ 106,567

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