LONG-TERM DEBT - Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Disclosure [Abstract]
Interest expense	$ 23,554	$ 25,734
Amortization of deferred financing costs	946	801
Amortization of original issue discount (premium) of senior notes	(849)	(715)
Interest income and other investment income	(30)	(600)
Total net interest expense	$ 23,621	$ 25,220