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PROPERTY AND EQUIPMENT, NET (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation $ 13,400 $ 13,500 $ 11,600
Additional equipment purchased $ 20,100 $ 16,200 $ 13,600