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Derivatives And Hedging Activities (Effect Of Derivative Financial Instruments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |  |
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments | $ 6,667 | $ 8,281 | $ 4,516
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments | 0 | 123 | 0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments | 103 | 341 | 379
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments | 34 | 269 | 15
Interest Rate Swap Agreements [Member] | Other Non-Current Assets [Member] |  |  |
Derivative [Line Items] |  |  |
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments | 6,075 | 8,262 | 4,516
Interest Rate Swap Agreements [Member] | Other Long-Term Liabilities [Member] |  |  |
Derivative [Line Items] |  |  |
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments | 0 | 0 | 0
Forward Foreign Currency Exchange Contract [Member] | Other Current Assets [Member] |  |  |
Derivative [Line Items] |  |  |
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments | 592 | 19 | 0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments | 103 | 341 | 379
Forward Foreign Currency Exchange Contract [Member] | Accounts Payable and Accrued Expenses [Member] |  |  |
Derivative [Line Items] |  |  |
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments | 0 | 123 | 0
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments | $ 34 | $ 269 | $ 15

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