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Derivative Instruments (Interest Rate Caps) (Details) - Interest Rate Caps - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Notional amount $ 79,000  
Derivative assets 1,244 $ 415
Interest Rate Caps, Maturity Date, July 7, 2021, 2.50%    
Derivative [Line Items]    
Notional amount $ 40,000  
Cap rate 2.50%  
Derivative assets $ 624 207
Interest Rate Caps, Maturity Date, July 8, 2021, 2.50%    
Derivative [Line Items]    
Notional amount $ 12,000  
Cap rate 2.50%  
Derivative assets $ 187 62
Interest Rate Caps, Maturity Date, July 29, 2021, 2.50%    
Derivative [Line Items]    
Notional amount $ 27,000  
Cap rate 2.50%  
Derivative assets $ 433 $ 146