SEGMENTS (Summary of Assets by Segment and Reconciliation of Segment Assets to Total Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Reconciliation of total segment assets to total assets
Assets	$ 9,119,724	$ 8,413,766
Operating Segments
Reconciliation of total segment assets to total assets
Assets	8,287,142	8,113,418
Operating Segments | Operating Assets
Reconciliation of total segment assets to total assets
Assets	3,527,387	3,476,718
Operating Segments | Master Planned Communities
Reconciliation of total segment assets to total assets
Assets	2,228,230	2,166,472
Operating Segments | Seaport District
Reconciliation of total segment assets to total assets
Assets	919,523	930,067
Operating Segments | Strategic Developments
Reconciliation of total segment assets to total assets
Assets	1,612,002	1,540,161
Corporate
Reconciliation of total segment assets to total assets
Assets	$ 832,582	$ 300,348