SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) segment $ / shares	Dec. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 USD ($) $ / shares
Amount of straight line rent receivables reclassified	$ 39,100	$ 31,500
Number of business segment | segment	3
Adjustment to depreciation due to change in estimated useful life	$ 116,401	81,878	$ 82,275
Impairments	0	(35,734)	0
Notes receivable, net	5,864	155
MUDs receivables, net of allowances	800	900
SID receivables	26,430	61,603
Deferred leasing costs, accumulated amortization	18,900	14,100
Service Life
Adjustment to depreciation due to change in estimated useful life	$ 25,500	$ 1,000	$ 17,100
Impact on diluted EPS resulting from depreciation adjustment | $ / shares	$ 0.59	$ 0.02	$ 0.40
Minimum | Master Planned Communities
Estimated useful life of MPC assets	20 years
Maximum | Master Planned Communities
Estimated useful life of MPC assets	40 years
Summerlin
Notes receivable, net	$ 5,300