GOODWILL AND OTHER INTANGIBLE ASSETS - Summary of Components of Amortizing Intangible Assets, Including Capitalized Software (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 182,371	$ 123,941
Accumulated Amortization	(109,329)	(98,275)
Acquired and developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	71,586	52,825
Accumulated Amortization	(52,097)	(48,063)
Customer relationships and trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	110,785	71,116
Accumulated Amortization	$ (57,232)	$ (50,212)