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GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 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