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Derivative Instruments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Derivative [Line Items]  
Derivative assets, fair value $ 1,135
Derivative liabilities, fair value 1,135
Not Designated as Hedging Instrument  
Derivative [Line Items]  
Notional 58,599
Derivative assets, fair value 1,135
Derivative liabilities, fair value 1,135
Not Designated as Hedging Instrument | Interest rate swap contracts  
Derivative [Line Items]  
Notional 58,599
Derivative assets, fair value 1,135
Derivative liabilities, fair value $ 1,135