SEGMENTS (Summary of Assets by Segment and Reconciliation of Segment Assets to Total Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Reconciliation of total segment assets to total assets
Assets	$ 7,416,007	$ 7,355,799
Operating Segments
Reconciliation of total segment assets to total assets
Assets	7,134,430	7,017,374
Operating Segments | Operating Assets
Reconciliation of total segment assets to total assets
Assets	2,706,132	2,562,257
Operating Segments | Master Planned Communities
Reconciliation of total segment assets to total assets
Assets	2,137,308	2,076,678
Operating Segments | Seaport District
Reconciliation of total segment assets to total assets
Assets	876,179	839,522
Operating Segments | Strategic Developments
Reconciliation of total segment assets to total assets
Assets	1,414,811	1,538,917
Corporate and other
Reconciliation of total segment assets to total assets
Assets	$ 281,577	$ 338,425