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GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Apr. 01, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Goodwill [Roll Forward]        
Balance at beginning of period   $ 880,251 $ 204,084 $ 204,084
Goodwill resulting from business combinations $ 675,643 (524) $ 678,941 676,167
Balance at end of period   $ 879,727   $ 880,251