Derivatives And Hedging Activities (Effect Of Derivative Financial Instruments On The Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	$ 4,516	$ 2,205	$ 853
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	0	55	0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	379	917	4
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	15	120	1,229
Interest Rate Swap Agreements [Member] | Other Non-Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments	4,516	2,149	853
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	56	0
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	379	917	4
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	55	0
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	$ 15	$ 120	$ 1,229