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Basis of Presentation (Details 2) (Rate Cap Transactions, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Sep. 30, 2012
instrument
Dec. 31, 2011
Rate Cap Transactions
   
Interest Rate Caps    
Number of letter agreements 2  
Variable interest rate basis Three month LIBOR  
Interest cap rate (as a percent) 3.25%  
Notional amount $ 50,000  
Period hedged 39 months  
Fair value $ 0 $ 8