Derivative Financial Instruments (Schedule Of Fair Values Of The Company's Derivative Instruments And The Line Items On The Consolidated Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1,116	$ 1,144
Derivative Liability, Fair Value, Gross Liability	503	1,619
Prepaid Expenses And Other Current Assets [Member] | Derivatives Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	967	1,142
Prepaid Expenses And Other Current Assets [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	149	2
Other Accrued Liabilities [Member] | Derivatives Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	449	1,616
Other Accrued Liabilities [Member] | Derivatives Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 54	$ 3