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Basis of Presentation and Significant Accounting Policies (Real Estate) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Real Estate [Line Items]
Real estate and accumulated depreciation life used for depreciation	40 years
Capitalized interest and debt expense during construction	$ 72,200,000	$ 73,166,000
Real estate impairment losses	107,221,000	12,000,000	$ 0
Moynihan Train Hall development expenditures	$ 914,960,000	445,693,000
Minimum
Real Estate [Line Items]
Real estate and accumulated depreciation life used for depreciation	7 years
Maximum
Real Estate [Line Items]
Real estate and accumulated depreciation life used for depreciation	40 years
Farley Office and Retail Building
Real Estate [Line Items]
Equity method ownership percentage	95.00%
Estimated Moynihan Train Hall development expenditures	$ 1,600,000,000
Moynihan Train Hall development expenditures	$ 914,960,000	$ 445,693,000
Joint Venture \| Farley Office and Retail Building
Real Estate [Line Items]
Equity method ownership percentage	95.00%
Affiliated Entity \| Farley Office and Retail Building
Real Estate [Line Items]
Equity method ownership percentage	5.00%