INCOME TAXES - Components of Tax Provision by Jurisdiction (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income tax expense/(benefit):
Federal	$ 24,200	$ 16,400	$ (2,000)
State and local	4,800	2,100	(100)
Current income tax expense (benefit)	29,000	18,500	(2,100)
Deferred income tax expense/(benefit):
Federal	9,500	14,500	51,200
State and local	4,000	5,800	1,000
Deferred income tax expense (benefit)	13,466	20,271	52,178
Income tax expense	$ 42,503	$ 38,859	$ 50,118