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Derivatives And Hedging Activities (Effect Of Derivative Financial Instruments On The Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2017
Derivative [Line Items]      
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments $ 9,527 $ 8,281 $ 1,204
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments 193 123 479
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments 10 341 623
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments 1,298 269 468
Interest Rate Swap Agreements [Member] | Other Non-Current Assets [Member]      
Derivative [Line Items]      
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments 9,527 8,262 1,201
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 0 19 3
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments 10 341 623
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 193 123 479
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments $ 1,298 $ 269 $ 468