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SUPPLEMENTARY CASH FLOW INFORMATION (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Supplementary Cash Flow Information      
Interest paid $ 959 $ 445 $ 471
Taxes paid 4,991 5,765 3,136
Equipment acquired under finance leases and equipment loans $ 1,771 $ 1,228 $ 3,452