INCOME TAXES (Summary of Tax Effects and Temporary Differences Included in Net Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Operating and Strategic Development properties, primary differences in basis of assets and liabilities	$ 83,263	$ 92,210
Interest deduction carryforwards	34,611	29,247
Operating loss and tax credit carryforwards	65,071	50,914
Total deferred tax assets	182,945	172,371
Valuation allowance	(25,304)	(17,271)
Total net deferred tax assets	157,641	155,100
Deferred tax liabilities:
Property Associated with Master Planned Communities, primarily differences in the tax basis of land assets and treatment of interest and other costs	(146,124)	(157,181)
Operating and Strategic Development properties, primarily differences in basis of assets and liabilities	(59,517)	(60,430)
Deferred income	(109,188)	(98,339)
Total deferred tax liabilities	(314,829)	(315,950)
Net deferred tax liabilities	$ (157,188)	$ (160,850)