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GOODWILL AND OTHER INTANGIBLE ASSETS GOODWILL AND OTHER INTANGIBLE ASSETS-Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]      
Balance at beginning of year $ 204,084 $ 204,084 $ 204,084
Goodwill 676,167 0 0
Balance at end of year $ 880,251 $ 204,084 $ 204,084