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Financial Instruments and Derivative Financial Instruments (Fair Value of Derivative Instruments as Recorded in Consolidated Balance Sheets) (Details) (Derivatives Designated as Hedging Instruments, USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Total derivatives designated as hedging instruments, asset derivatives $ 205 $ 0
Total derivatives designated as hedging instruments, asset derivatives 227 460
Other Current Liabilities
   
Derivatives, Fair Value [Line Items]    
Interest rate swap agreements, asset derivatives 0 0
Interest rate swap agreements, liability derivatives 227 456
Prepaid Expenses and Other
   
Derivatives, Fair Value [Line Items]    
Foreign currency exchange contracts, asset derivatives 205 0
Foreign currency exchange contracts, liability derivatives $ 0 $ 4