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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2013
Financial Instruments [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   June 30, December 31,
   2013 2012
   Carrying Amount Fair Value Carrying Amount Fair Value
 Current and long-term debt and capital lease obligations$975,675 963,152 957,663 979,594
 Other liabilities$25,899 25,069 25,511 24,766
Fair Value Assets And Liabilities Measured On Recurring Basis [Table Text Block]
   Fair Value Measurement at Reporting Date Using
 June 30, 2013 Assets Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3)
 Deferred compensation plan assets (mutual funds)$ 1,945  -  -
 Total assets at fair value$ 1,945  -  -
        
 December 31, 2012 Assets      
 Deferred compensation plan assets (mutual funds)$ 1,758  -  -
 Total assets at fair value$ 1,758  -  -