INCOME TAXES - Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
U.S. statutory rate	21.00%	34.00%	35.00%
Current benefit or REIT election	(21.00%)	(34.10%)	(140.40%)
State and local income taxes, net of federal tax benefits	0.70%	0.10%	0.50%
Benefit of federal income tax credits	(0.00%)	(0.50%)	(0.10%)
Valuation allowance	0.00%	0.40%	0.00%
Permanent differences	0.00%	0.10%	0.00%
Effective Income Tax Rate	0.70%	0.00%	(105.00%)
Effective income tax rate reconciliation, real estate investment trust election, current benefit	105.40%