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Derivative Instruments (Interest Rate Caps) (Details) (Interest Rate Caps [Member], Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Derivative assets $ 5,356 $ 3,247
SunTrust [Member]
   
Derivative [Line Items]    
Notional amount 79,000  
Derivative assets 5,356 3,247
Interest Rate Caps, Maturity Date, July 7, 2021, 2.50% [Member] | SunTrust [Member]
   
Derivative [Line Items]    
Notional amount 40,000  
Cap rate 2.50%  
Derivative assets 2,697 1,634
Interest Rate Caps, Maturity Date, July 8, 2021, 2.50% [Member] | SunTrust [Member]
   
Derivative [Line Items]    
Notional amount 12,000  
Cap rate 2.50%  
Derivative assets 809 490
Interest Rate Caps, Maturity Date, July 29, 2021, 2.50% [Member] | SunTrust [Member]
   
Derivative [Line Items]    
Notional amount 27,000  
Cap rate 2.50%  
Derivative assets $ 1,850 $ 1,123