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Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2012
Financial Instruments [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   September 30, December 31,
   2012 2011
   Carrying Amount Fair Value Carrying Amount Fair Value
 Current and long-term debt and capital lease obligations$948,722 999,411 947,326 942,895
 Other liabilities 25,705 24,928 24,456 23,627
Fair Value Assets And Liabilities Measured On Recurring Basis [Table Text Block]
   Fair Value Measurement at Reporting Date Using
 September 30, 2012 Assets Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3)
 Deferred compensation plan assets (mutual funds)$ 1,728  -  -
 Total assets at fair value$ 1,728  -  -
        
 December 31, 2011 Assets      
 Deferred compensation plan assets (mutual funds)$ 1,600  -  -
 Total assets at fair value$ 1,600  -  -