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SUPPLEMENTARY CASH FLOW INFORMATION (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplementary Cash Flow Information      
Interest paid $ 618 $ 959 $ 445
Taxes paid 2,373 4,991 5,765
Equipment acquired under finance leases and equipment loans $ 122 $ 1,771 $ 1,228