REAL ESTATE AND OTHER AFFILIATES (Relevant Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Real Estate and Other Affiliates
Total Assets	$ 9,244,558		$ 9,244,558			$ 8,413,766
Total Liabilities	5,504,855		5,504,855			5,080,778
Total Equity	3,739,703	$ 3,351,767	3,739,703	$ 3,351,767	$ 3,772,598	3,332,988	$ 3,307,473	$ 3,238,126
Revenues	156,173	431,316	331,348	785,206
Net (loss) income	(34,103)	13,328	(159,185)	45,253
Equity Method Investment, Nonconsolidated Investee or Group of Investees | The Summit
Real Estate and Other Affiliates
Total Assets	243,112		243,112			221,277
Total Liabilities	152,904		152,904			136,314
Total Equity	90,208		90,208			$ 84,963
Revenues	18,836	27,704	58,672	58,187
Net (loss) income	(2,968)	6,500	7,591	14,336
Gross Margin	$ (1,448)	$ 8,415	$ 10,256	$ 16,747