Segments (Summary of Assets by Segment and Reconciliation of Segment Assets to Total Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Reconciliation of total segment assets to total assets
Assets	$ 9,467,687	$ 9,581,694
Operating segments
Reconciliation of total segment assets to total assets
Assets	9,082,351	8,904,499
Operating segments | Operating Assets
Reconciliation of total segment assets to total assets
Assets	3,543,302	3,607,718
Operating segments | MPC Segment
Reconciliation of total segment assets to total assets
Assets	3,066,995	3,056,240
Operating segments | Seaport Segment
Reconciliation of total segment assets to total assets
Assets	1,121,784	1,046,992
Operating segments | Strategic Developments Segment
Reconciliation of total segment assets to total assets
Assets	1,350,270	1,193,549
Corporate
Reconciliation of total segment assets to total assets
Assets	$ 385,336	$ 677,195