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Derivative Financial Instruments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
item
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
item
Dec. 31, 2014
USD ($)
item
Mar. 31, 2014
Non-Qualifying | Basis Swaps            
Derivative Financial Instruments            
Count | item         1  
Notional Value, classified in Other Assets $ 3,000   $ 3,000   $ 3,000  
Fair Value, classified in Other Assets         $ 2  
Decrease in notional value       $ 8,600    
Non-Qualifying | Basis Swaps | Maximum            
Derivative Financial Instruments            
Fair Value, classified in Other Assets 100   100      
Change in fair value (100) $ (100) (100) (100)    
Non-Qualifying | LIBOR Caps            
Derivative Financial Instruments            
Count | item         1  
Notional Value, classified in Other Assets         $ 71,701  
Notional value of matured instruments     71,700      
Cap rate (as a percent)           6.00%
Non-Qualifying | LIBOR Caps | Maximum            
Derivative Financial Instruments            
Change in fair value $ (100) $ (100) $ (100) $ (100)    
Qualifying | LIBOR Caps            
Derivative Financial Instruments            
Count | item 1   1      
Notional Value, classified in Other Assets $ 43,500   $ 43,500      
Fair Value, classified in Other Assets $ 15   $ 15      
Cap rate (as a percent) 2.00%   2.00%      
Qualifying | Interest Rate Swaps            
Derivative Financial Instruments            
Count | item 6   6   12  
Notional Value, classified in Other Liabilities $ 115,721   $ 115,721   $ 250,321  
Fair Value, classified in Other Liabilities (7,546)   (7,546)   $ (13,908)  
Number of swaps matured | item   2   2    
Notional value of matured instruments       $ 32,000    
Interest expense expected to be reclassified from qualifying cash flow hedges over the next twelve months $ (5,600)   $ (5,600)