FAIR VALUE MEASUREMENTS (Change in Fair Value at Level 3) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Change in Fair Value Measurement Categorized in Level 3 [Roll Forward]
Transfers into Level 3	$ 0	$ 0	$ 0	$ 0
Transfers out of Level 3	0	$ 0	0	$ 0
Contingent Consideration
Change in Fair Value Measurement Categorized in Level 3 [Roll Forward]
Balance at beginning of period	24,300,000		0
Additions	0		77,300,000
Accretion on discounted liabilities	1,500,000		1,500,000
Settlements	400,000		400,000
Unrealized gain included in earnings	(13,800,000)		(66,800,000)
Balance at end of period	$ 12,400,000		$ 12,400,000