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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Impaired long-lived assets
Jun. 30, 2014
Significant Other Observable Inputs (Level 2)
Recurring basis
Dec. 31, 2013
Significant Other Observable Inputs (Level 2)
Recurring basis
Jun. 30, 2014
Significant Unobservable Inputs (Level 3)
Nonrecurring basis
Jun. 30, 2013
Significant Unobservable Inputs (Level 3)
Nonrecurring basis
Summarizes the valuation of interest rate swaps and impaired assets          
Interest rate swaps asset     $ 322    
Interest rate swaps liability   (4,294) (3,374)    
Impaired long-lived assets       1,671 3,825
Inventory write-down - Restructuring       $ 2,331  
Weighted average disposal period of impaired assets 4 years        
Discount rate (as a percent) 8.60%