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Derivative instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
May 31, 2017
Derivative      
Net change in fair value of cash flow hedge $ 132 $ (208)  
Gain loss in fair value 0 0  
Swap liability 208 $ 208  
Interest Rate Swap      
Derivative      
Interest rate expense $ 200    
LIBOR | Nondesignated | Interest Rate Swap      
Derivative      
Notional amount     $ 100,000