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Other assets and gain on sale of merchant services business - Additional Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Proceeds from the sale of merchant services business $ 2,300  
Net gain on sale of business 2,278  
Property, Plant and Equipment, Net 37,373 $ 33,260
Other Assets    
Property, Plant and Equipment, Net $ 22