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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]      
Cash paid for income taxes $ 13,509 $ 11,420 $ 20,432
Income tax refunds received 5 191 3,003
Cash paid for interest 2,583 1,400 1,185
Noncash financing and investing activity [Abstract]      
Fixed assets acquired (adjusted) related to capital lease and financing obligations 3,176 28,536 (2,600)
Increase in financing obligations $ 6,594 $ 32,999 $ (2,600)