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Derivative Instruments Derivative Instruments Interest Rate Caps (Details) (Derivative Counterparty, SunTrust [Member], Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Derivative [Line Items]    
Notional Amount $ 79,000  
Derivative Asset, Fair Value, Gross Asset 3,252 0
Interest Rate Cap [Member]
    
Derivative [Line Items]    
Derivative, Fixed Interest Rate 2.50%  
Interest Rate Caps, Maturity Date, July 7, 2021, 2.50% [Member]
    
Derivative [Line Items]    
Notional Amount 40,000  
Derivative, Description of Variable Rate Basis *LIBOR  
Derivative, Fixed Interest Rate 2.50%  
Derivative Asset, Fair Value, Gross Asset 1,637 0
Interest Rate Caps, Maturity Date, July 8, 2021, 2.50% [Member]
    
Derivative [Line Items]    
Notional Amount 12,000  
Derivative, Description of Variable Rate Basis *LIBOR  
Derivative, Fixed Interest Rate 2.50%  
Derivative Asset, Fair Value, Gross Asset 491 0
Interest Rate Caps, Maturity Date, July 29, 2021, 2.50% [Member]
    
Derivative [Line Items]    
Notional Amount 27,000  
Derivative, Description of Variable Rate Basis *LIBOR  
Derivative, Fixed Interest Rate 2.50%  
Derivative Asset, Fair Value, Gross Asset $ 1,124 $ 0