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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
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