GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Goodwill [Roll Forward]
Balance at beginning of period	$ 937,771	$ 879,727	$ 937,771	$ 880,251
Goodwill resulting from business combinations	0	57,962	0	57,438
Balance at end of period	$ 937,771	$ 937,689	$ 937,771	$ 937,689