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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]      
Cash paid for income taxes $ 18,763 $ 26,574 $ 13,509
Income tax refunds received 9 100 5
Cash paid for interest 2,486 2,540 2,583
Noncash financing and investing activity [Abstract]      
Fixed assets acquired (adjusted) related to capital lease and financing obligations 1,009 3,890 3,176
Increase in financing obligations $ 2,598 $ 5,474 $ 6,594