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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2013
Fair Value Measurements [Abstract]  
Assets (liabilities) measured at fair value on a recurring basis
Assets (liabilities) measured at fair value on a recurring basis are as follows:
      
Fair Value Measurement Using
 
   
 
Total
March 31, 2013
  
Quoted Prices in Active Markets for Identical Contracts (Level 1)
  
Significant
Other Observable Inputs
(Level 2)
 
Interest rate swaps
 $(1,766) $  $(1,766)
Commodity contracts
 $(226) $  $(226)
       
Fair Value Measurement Using
 
   
 
Total
December 31, 2012
  
Quoted Prices in Active Markets for Identical Contracts (Level 1)
  
Significant
Other Observable Inputs
(Level 2)
 
Interest rate swaps
 $(2,973) $  $(2,973)
Commodity contracts
 $111  $  $111