LONG-TERM DEBT - Net Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest Expense, Debt [Abstract]
Interest expense	$ 87,530	$ 86,579	$ 100,757
Amortization of deferred financing costs	5,613	3,981	3,085
Amortization of original issue discount (premium) of senior notes	(1,582)	(3,395)	(2,928)
Interest income and other investment income	(50)	(69)	(811)
Total net interest expense	$ 91,511	$ 87,096	$ 100,103
Weighted average interest rate under credit facility	2.60%	2.60%
Notional amount				$ 560,000	$ 560,000