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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]      
Cash paid for income taxes $ 26,574 $ 13,509 $ 11,420
Income tax refunds received 100 5 191
Cash paid for interest 2,540 2,583 1,400
Noncash financing and investing activity [Abstract]      
Fixed assets acquired (adjusted) related to capital lease and financing obligations 3,890 3,176 28,536
Increase in financing obligations $ 5,474 $ 6,594 $ 32,999