Segments (Summary of Assets by Segment and Reconciliation of Segment Assets to Total Assets) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Reconciliation of total segment assets to total assets
Assets	$ 9,368,568		$ 9,368,568		$ 9,603,463
Impairment charges, including equity method investment		$ 0		$ 0
Seaport Segment
Reconciliation of total segment assets to total assets
Impairment charges, including equity method investment	709,493		709,493
Operating segments
Reconciliation of total segment assets to total assets
Assets	8,980,659		8,980,659		9,247,608
Operating segments | Operating Assets Segment
Reconciliation of total segment assets to total assets
Assets	3,532,554		3,532,554		3,448,823
Operating segments | MPC Segment
Reconciliation of total segment assets to total assets
Assets	3,438,699		3,438,699		3,272,655
Operating segments | Seaport Segment
Reconciliation of total segment assets to total assets
Assets	471,977		471,977		1,166,950
Operating segments | Strategic Developments Segment
Reconciliation of total segment assets to total assets
Assets	1,537,429		1,537,429		1,359,180
Corporate
Reconciliation of total segment assets to total assets
Assets	$ 387,909		$ 387,909		$ 355,855