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Derivative Financial Instruments (Details 2) (Designated as cash flow hedging instruments, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Entity's derivative instruments within the condensed consolidated balance sheets    
Asset derivatives $ 2 $ 12
Liability derivatives 4,005 6,615
Interest rate cap
   
Entity's derivative instruments within the condensed consolidated balance sheets    
Asset derivatives 2 12
Interest rate cap | Other current assets
   
Entity's derivative instruments within the condensed consolidated balance sheets    
Asset derivatives 2 8
Interest rate cap | Other long-term assets
   
Entity's derivative instruments within the condensed consolidated balance sheets    
Asset derivatives   4
Interest rate swaps
   
Entity's derivative instruments within the condensed consolidated balance sheets    
Liability derivatives 4,005 6,615
Interest rate swaps | Other current liabilities
   
Entity's derivative instruments within the condensed consolidated balance sheets    
Liability derivatives 4,000 4,100
Interest rate swaps | Other long-term liabilities
   
Entity's derivative instruments within the condensed consolidated balance sheets    
Liability derivatives   $ 2,500