SEGMENTS - Supplemental Information (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total real estate investments	$ 1,805,281	$ 1,564,955
Accumulated depreciation	(614,584)	(598,846)
Total real estate investments, net	1,190,697	966,109
Cash and cash equivalents	92,041	64,466
Total assets	1,343,098	1,068,659
Long-term debt, net of deferred financing costs	615,892	515,539
Operating Segments | Real Estate Operations
Segment Reporting Information [Line Items]
Total real estate investments	1,788,462	1,548,259
Accumulated depreciation	(607,556)	(592,293)
Total real estate investments, net	1,180,906	955,966
Cash and cash equivalents	90,690	63,229
Total assets	1,331,213	1,056,500
Long-term debt, net of deferred financing costs	615,892	515,539
Operating Segments | Restaurant Operations
Segment Reporting Information [Line Items]
Total real estate investments	16,819	16,696
Accumulated depreciation	(7,028)	(6,553)
Total real estate investments, net	9,791	10,143
Cash and cash equivalents	1,351	1,237
Total assets	11,885	12,159
Long-term debt, net of deferred financing costs	$ 0	$ 0