Quarterly report pursuant to Section 13 or 15(d)

GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details)

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GOODWILL AND INTANGIBLE ASSETS - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]          
Impairment of intangible assets, indefinite-lived $ 0        
Amortization expense related to purchased intangible assets   $ 39,200,000 $ 41,800,000 $ 81,400,000 $ 86,800,000