OTHER ITEMS IMPACTING COMPARABILITY - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2020 instrument	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		$ 76,364	$ 35,308	$ 5,597
Number of instruments with early redemption | instrument	2
Discontinued Insurance Liability Program and Shutdown of Leased Locations
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		44,000
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other, net		$ 13,000