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Fair Value of Financial Instruments (Details) (Recurring, USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Level 2 | Interest rate cap
   
Fair value information    
Derivative assets $ 2 $ 12
Level 2 | Interest rate swaps
   
Fair value information    
Derivative liabilities 4,005 6,615
Total Fair Value | Interest rate cap
   
Fair value information    
Derivative assets 2 12
Total Fair Value | Interest rate swaps
   
Fair value information    
Derivative liabilities $ 4,005 $ 6,615