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Derivative Instruments (Interest Rate Swap) (Details) - Interest Rate Swap, Maturity Date, March 15, 2021, 2.415% [Member] - Interest Rate Swap [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Derivative [Line Items]    
Notional amount $ 85,500  
Pay rate 2.415%  
Derivative assets $ 850  
Derivative liabilities   $ (789)