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Derivatives (Interest rate swap and their term) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Derivative [Line Items]  
Notional Amount $ 42,400
Interest rate swap designated as cash flow hedges - 1 Month LIBOR  
Derivative [Line Items]  
Notional Amount 33,175
Interest rate swap designated as cash flow hedges - 1 Month LIBOR | Rate 2.4210% [Member]  
Derivative [Line Items]  
Notional Amount $ 33,175
Fixed rate 0.02421%
Trade Date Jul. 03, 2013
Settlement Date Jul. 03, 2013
Maturity Date Aug. 01, 2023