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Other expenses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of other operating expense [Abstract]      
Advertising and marketing $ 683 $ 785 $ 829
Regulatory Fees 977 1,348 1,565
Rental - office and equipment 2,394 2,681 3,019
Administrative 6,846 7,468 7,469
Professional services 3,911 4,255 4,621
Maintenance and repairs 1,673 1,866 1,635
Other 322 129 244
Total $ 16,806 $ 18,532 $ 19,382