GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Goodwill (Details) - USD ($) $ in Thousands			3 Months Ended	9 Months Ended		12 Months Ended
	Aug. 30, 2019	Apr. 01, 2018	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Document Period End Date				Sep. 30, 2019
Goodwill [Roll Forward]
Balance at beginning of period				$ 880,251	$ 204,084	$ 204,084
Goodwill resulting from business combinations	$ 58,000	$ 675,643	$ 58,000	57,438	$ 676,949	676,167
Balance at end of period			$ 937,689	$ 937,689		$ 880,251