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Derivative Instruments (Interest Rate Caps) (Details) (Interest Rate Caps [Member], SunTrust [Member], Not Designated as Hedging Instrument [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivative [Line Items]    
Notional amount $ 79,000  
Derivative assets 4,926 6,103
Interest Rate Caps, Maturity Date, July 7, 2021, 2.50% [Member]
    
Derivative [Line Items]    
Notional amount 40,000  
Cap rate 2.50%  
Derivative assets 2,481 3,073
Interest Rate Caps, Maturity Date, July 8, 2021, 2.50% [Member]
    
Derivative [Line Items]    
Notional amount 12,000  
Cap rate 2.50%  
Derivative assets 745 923
Interest Rate Caps, Maturity Date, July 29, 2021, 2.50% [Member]
    
Derivative [Line Items]    
Notional amount 27,000  
Cap rate 2.50%  
Derivative assets $ 1,700 $ 2,107