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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Significant Other Observable Inputs (Level 2) [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of long-term debt $ 1,182,429  
Aggregate carrying value of long-term debt 1,182,429  
Interest rate swaps [Member] | Fair value measurements on recurring basis [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives 452 1,236
Interest rate swaps [Member] | Fair value measurements on recurring basis [Member] | Quoted Prices in Active Markets for Identical Contracts (Level 1) [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives 0 0
Interest rate swaps [Member] | Fair value measurements on recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives 452 1,236
Commodity contracts [Member] | Fair value measurements on recurring basis [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives (255) 69
Commodity contracts [Member] | Fair value measurements on recurring basis [Member] | Quoted Prices in Active Markets for Identical Contracts (Level 1) [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives 0 0
Commodity contracts [Member] | Fair value measurements on recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives (255) 69
Foreign Currency Contract [Member] | Fair value measurements on recurring basis [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives (30) 56
Foreign Currency Contract [Member] | Fair value measurements on recurring basis [Member] | Quoted Prices in Active Markets for Identical Contracts (Level 1) [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives 0 0
Foreign Currency Contract [Member] | Fair value measurements on recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Assets (liabilities) measured at fair value on a recurring basis [Abstract]    
Fair value of derivatives $ (30) $ 56