REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Schedule of Depreciation and Amortization Expense on Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate [Abstract]
Depreciation expense	$ 28,271	$ 26,031	$ 23,922
Amortization expense	11,968	13,302	15,031
Total real estate depreciation and amortization expense	40,239	39,333	38,953
Depreciation on corporate fixed assets	$ 93	$ 114	$ 108