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PROPERTY AND EQUIPMENT, NET (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Depreciation $ 13,500 $ 11,600 $ 10,900
Additional equipment purchased $ 16,200 $ 13,600 $ 18,700