Derivatives And Hedging Activities (Effect Of Derivative Financial Instruments On The Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments		$ 12,593	$ 12,486
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	883
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	15	1,222	172
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	474	243	272
Forward Foreign Currency Exchange Contracts [Member] | Other Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments		2,400
Derivatives in a Fair Value Asset Position Not Designated as Hedging Instruments	15	1,222	172
Forward Foreign Currency Exchange Contracts [Member] | Accounts Payable And Accrued Expenses [Member]
Derivative [Line Items]
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	63
Derivatives in a Fair Value Liability Position Not Designated as Hedging Instruments	474	243	272
Fair Value Hedges [Member] | Interest Rate Swap Agreements [Member] | Other Non-Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments		10,193	12,486
Fair Value Hedges [Member] | Interest Rate Swap Agreements [Member] | Long-Term Obligations [Member]
Derivative [Line Items]
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments
Cash Flow Hedges [Member] | Interest Rate Swap Agreements [Member] | Other Non-Current Assets [Member]
Derivative [Line Items]
Derivatives in a Fair Value Asset Position Designated as Hedging Instruments
Cash Flow Hedges [Member] | Interest Rate Swap Agreements [Member] | Other Long-Term Liabilities [Member]
Derivative [Line Items]
Derivatives in a Fair Value Liability Position Designated as Hedging Instruments	$ 820