INCOME TAXES (Summary of Tax Effects and Temporary Differences Included in Net Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Operating and Strategic Developments properties, primarily differences in basis of assets and liabilities	$ 65,590	$ 83,263
Interest deduction carryforwards	0	34,611
Operating loss and tax credit carryforwards	132,277	65,071
Total deferred tax assets	197,867	182,945
Valuation allowance	(29,723)	(25,304)
Total net deferred tax assets	168,144	157,641
Deferred tax liabilities:
Property associated with MPCs, primarily differences in the tax basis of land assets and treatment of interest and other costs	(163,024)	(146,124)
Operating and Strategic Developments properties, primarily differences in basis of assets and liabilities	(67,125)	(59,517)
Deferred income	(118,743)	(109,188)
Total deferred tax liabilities	(348,892)	(314,829)
Total net deferred tax liabilities	$ (180,748)	$ (157,188)