INCOME TAXES - Components of Tax Provision by Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income tax expense/(benefit):
Federal	$ 41,600	$ 24,200	$ 16,400
State and local	10,600	4,800	2,100
Current income tax expense (benefit)	52,200	29,000	18,500
Deferred income tax expense/(benefit):
Federal	(22,500)	9,500	14,500
State and local	(4,100)	4,000	5,800
Deferred income tax expense (benefit)	(26,560)	13,466	20,271
Income tax expense	$ 25,635	$ 42,503	$ 38,859