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GOODWILL AND INTANGIBLE ASSETS (Schedule of Carrying Amounts of Intangible Assets) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 417,345 $ 410,365
Accumulated Amortization (258,299) (231,037)
Net Carrying Value 159,046 179,328
Licensed technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 56,526 49,546
Accumulated Amortization (34,470) (30,062)
Net Carrying Value 22,056 19,484
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 285,443 285,443
Accumulated Amortization (183,849) (164,406)
Net Carrying Value 101,594 121,037
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 69,776 69,776
Accumulated Amortization (34,380) (31,246)
Net Carrying Value 35,396 38,530
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 5,600 5,600
Accumulated Amortization (5,600) (5,323)
Net Carrying Value $ 0 $ 277
Useful life 3 years 3 years
Minimum | Licensed technology    
Finite-Lived Intangible Assets [Line Items]    
Useful life 1 year 1 year
Minimum | Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Useful life 4 years 4 years
Minimum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful life 4 years 4 years
Maximum | Licensed technology    
Finite-Lived Intangible Assets [Line Items]    
Useful life 8 years 8 years
Maximum | Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Useful life 7 years 7 years
Maximum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful life 9 years 9 years