STOCK-BASED COMPENSATION - Schedule of Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation before tax	$ 2,723	$ 1,401
Income tax benefit	(697)	(364)
Patient care costs
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation before tax	212	184
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total stock-based compensation before tax	$ 2,511	$ 1,217