SEGMENTS (Summary of Assets by Segment and Reconciliation of Segment Assets to Total Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of total segment assets to total assets
Assets	$ 9,140,332	$ 8,413,766
Operating Segments
Reconciliation of total segment assets to total assets
Assets	8,278,491	8,113,418
Operating Segments | Operating Assets
Reconciliation of total segment assets to total assets
Assets	3,936,119	3,476,718
Operating Segments | Master Planned Communities
Reconciliation of total segment assets to total assets
Assets	2,285,896	2,166,472
Operating Segments | Seaport District
Reconciliation of total segment assets to total assets
Assets	924,245	930,067
Operating Segments | Strategic Developments
Reconciliation of total segment assets to total assets
Assets	1,132,231	1,540,161
Corporate
Reconciliation of total segment assets to total assets
Assets	$ 861,841	$ 300,348