Hedging Activities And Fair Value Measurements (Schedule Of Notional Amounts, Fair Values And Classification Of The Company's Outstanding Derivatives By Risk Category And Instrument Type) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member] | Interest Rate Swap Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	$ 126,684	[1]	$ 75,920	[1]
Liability Derivatives Fair Value	788	[1]	855	[1]
Derivatives Not Designated As Hedging Instruments [Member] | Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			228,338	[1]
Asset Derivatives Fair Value			150	[1]
Liability Derivatives Fair Value			2,029	[1]
Derivatives Not Designated As Hedging Instruments [Member] | Accrued Liabilities [Member] | Foreign Currency Forwards [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	16,287	[1]
Asset Derivatives Fair Value	9	[1]
Liability Derivatives Fair Value	1,523	[1]
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Notional Amount			14,138	[1]
Asset Derivatives Fair Value			43	[1]
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member] | Foreign Currency Forwards [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	57,906	[1]
Asset Derivatives Fair Value	1,355	[1]
Liability Derivatives Fair Value	$ 352	[1]

[1] Notional amounts represent the gross contract amounts of the outstanding derivatives excluding the total notional amount of positions that have been effectively closed through offsetting positions. The net gains and net losses associated with positions that have been effectively closed through offsetting positions but not yet settled are included in the asset and liability derivatives fair value columns, respectively.