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Derivative Instruments (Interest Rate Caps) (Details) - Interest Rate Caps - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Derivative [Line Items]    
Notional amount $ 79,000  
Derivative assets 59 $ 597
Interest Rate Caps, Maturity Date, July 7, 2021, 2.50%    
Derivative [Line Items]    
Notional amount $ 40,000  
Cap rate 2.50%  
Derivative assets $ 29 302
Interest Rate Caps, Maturity Date, July 8, 2021, 2.50%    
Derivative [Line Items]    
Notional amount $ 12,000  
Cap rate 2.50%  
Derivative assets $ 9 91
Interest Rate Caps, Maturity Date, July 29, 2021, 2.50%    
Derivative [Line Items]    
Notional amount $ 27,000  
Cap rate 2.50%  
Derivative assets $ 21 $ 204