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GOODWILL (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Goodwill [Roll Forward]      
Beginning balance $ 317,676 $ 293,525 $ 293,525
Goodwill acquired 13,632   31,330
Goodwill related to partnership interest sold 0   (7,325)
Goodwill write-off related to closed clinics (1,859) $ 0 0
Goodwill adjustments for purchase price allocation of businesses acquired in prior year 1,320   146
Ending balance $ 330,769   $ 317,676