GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Goodwill [Roll Forward]
Balance at beginning of period	$ 937,771	$ 937,771	$ 937,771	$ 937,771
Goodwill resulting from business combinations	0	0	0	0
Balance at end of period	$ 937,771	$ 937,771	$ 937,771	$ 937,771