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Derivatives (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Mortgage Loans | LIBOR    
Derivative [Line Items]    
Basis spread on variable rate for debt 1.325% 1.325%
Interest Rate Cap    
Derivative [Line Items]    
Premium paid on derivative for right to receive cash payments   $ 2,000
Floor interest rate on derivative 2.35%  
Cap interest rate on derivative 3.675%  
Interest Rate Cap | Other assets    
Derivative [Line Items]    
Derivative asset, notional amount $ 35,000 $ 35,000