NOTES AND BONDS PAYABLE - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Nov. 13, 2020	Oct. 05, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Interest expense	$ 6,274	$ 7,359	$ 19,055	$ 21,776
Amortization of deferred financing costs	800	900	2,500	2,600
Interest capitalized			2,368	2,079
Interest payable	2,300		2,300				$ 4,800
Debt obligations scheduled to mature over the next 12 months	387,178		387,178
Subsequent Event
Debt Instrument [Line Items]
Debt obligations scheduled to mature over the next 12 months					$ 357,900
Debt obligations outstanding with extension options					$ 350,900
Subsequent Event | POSOR II
Debt Instrument [Line Items]
Debt obligations scheduled to mature over the next 12 months						$ 155,100
Undeveloped Land
Debt Instrument [Line Items]
Interest capitalized	$ 700	$ 700	$ 2,400	$ 2,100