FAIR VALUE OF FINANCIAL INSTRUMENTS - Nonrecurring Fair Values (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	May 01, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
FAIR VALUE OF FINANCIAL INSTRUMENTS
Impairment of real estate		$ 0	$ 1,400	$ 0	$ 1,350	$ 0
Operating lease income	$ 3,900	27,780			56,701
Loss on sale of real estate	3,500
Depreciation and amortization	400	$ 9,935		$ 10,656	$ 20,162	$ 21,479
Loss on sale of real estate	$ 20