INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective income tax rate reconciliation [Abstract]
Income taxes computed at the federal statutory rate	$ 10,515	$ 27,856	$ 29,005
Benefit of REIT status	(10,512)	(27,854)	(29,003)
Income taxes computed on income of the Company’s taxable REIT subsidiary	3	2	2
Alternative minimum tax credit refund receivable		(1,941)
Change in deferred asset balance due to change in corporate tax rate		29
Other change in net deferred income tax assets	$ (3)	(31)	$ (2)
Income tax (benefit) provision recorded in miscellaneous other revenue (expense)		$ (1,941)