Summary of Significant Accounting Policies (Operating Partnership) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Revenue from Contract with Customer, Including Assessed Tax	$ 60,089,000	$ 257,219,000	$ 256,910,000
Number of Days Invoices Generally Due	30 days
The Operating Partnership [Abstract]
Number Of Classes Of Preferred Equity	two
Number of Operating Partnership units outstanding (in shares)	87,644,651	85,946,862	85,788,252
Number Of Operating Partnership Units Outstanding Owned By Company	61,228,579	61,069,108	60,832,918
Number of Operating Partnership units outstanding owned by noncontrolling interests	26,416,072	24,877,754	24,955,334
Noncontrolling Interest, Ownership Percentage by Parent	70.00%	71.00%	71.00%
Average ownership percentage of the Company in the Operating Partnership (in hundredths)	70.00%	71.00%	71.00%
Relationship between TRG units owned by TCO and TCO common shares outstanding	one-for-one
Common stock, shares outstanding	61,228,579	61,069,108
Restructuring Charges	$ 3,543,000	$ 596,000	$ 13,848,000
Restructuring Reserve	200,000
Costs Associated With Shareowner Activism	$ 17,305,000	12,500,000	14,500,000
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	30.00%
Substantial Doubt about Going Concern, Management's Evaluation	When preparing financial statements for each annual and interim reporting period, management has the responsibility to evaluate whether there are conditions or events, considered in the aggregate, that raise substantial doubt about our ability to continue as a going concern within one year after the date that the financial statements are issued. No such conditions or events were identified as of the issuance date of the financial statements contained in this Annual Report on Form 10-K.
Impairment of Real Estate	$ 72,232,000	0	$ 0
Accounts Receivable, Credit Loss Expense (Reversal)		$ 10,400,000
Series B Preferred Stock [Member]
The Operating Partnership [Abstract]
Preferred Stock, shares outstanding	26,398,473	24,862,994