SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended			24 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / shares	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of business segment | segment		4
Adjustment to depreciation due to change in estimated useful life		$ 143,698	$ 113,518	$ 116,401
Special Improvement District receivable	$ 42,996	42,996	18,838		$ 42,996
TIF receivable	3,931	3,931	2,470		3,931
Tenant incentives and other receivables	7,556	7,556	8,745		7,556
Deferred leasing costs, accumulated amortization	31,700	31,700	24,800		31,700
Operating lease right-of-use assets, net	69,398	69,398			69,398
Operating lease obligations	70,413	$ 70,413			70,413
Lease termination period		1 year
Average remaining term of lease		5 years
Net investment in lease receivable	79,200	$ 79,200			79,200
Loans and leases receivable	78,900	78,900			78,900
Sales-type lease, unguaranteed residual asset	300	300			300
Transfer of financial assets accounted for as sales, amount derecognized	$ 66,000	$ 66,000			$ 66,000
Service Life
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to depreciation due to change in estimated useful life				$ 25,500
Impact on diluted EPS resulting from depreciation adjustment (in dollars per share) | $ / shares				$ 0.59
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases remaining lease term		1 year
Lease renewal term	2 years	2 years			2 years
Minimum | Master Planned Communities revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of MPC assets		20 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases remaining lease term		53 years
Lease renewal term	40 years	40 years			40 years
Maximum | Master Planned Communities revenues
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of MPC assets		40 years
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease right-of-use assets, net						$ 73,100
Operating lease obligations						$ 72,000
Allowance for doubtful accounts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase from write-offs		$ 900	4,714	$ 1,209
Downtown Summerlin and Seaport District Tenants | Allowance for doubtful accounts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase from write-offs					$ 3,200
Below-market ground leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Special Improvement District receivable	$ 43,000	43,000	$ 18,800		43,000
2019 Restructuring Plan
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring Costs	2,000,000
(Loss) gain on disposal of operating assets	4,800
2019 Restructuring Plan | Employee Severance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring Costs	34,300
2019 Restructuring Plan | Employee Severance | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring and Related Cost, Expected Cost	4,200	4,200			4,200
2019 Restructuring Plan | Employee Severance | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restructuring and Related Cost, Expected Cost	$ 6,200	$ 6,200			$ 6,200