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Investments in Partially Owned Entities (61 Ninth Avenue, Urban Edge Properties and 512 22nd Street) (Details) ft² in Thousands, $ in Thousands							12 Months Ended
	Dec. 23, 2019	Jun. 28, 2019 USD ($) ft²	Jun. 27, 2019 USD ($)	Mar. 04, 2019 USD ($) shares	Jan. 28, 2019 USD ($) ft²	Jan. 27, 2019 USD ($)	Dec. 31, 2019 USD ($)
Urban Edge Properties
Schedule of Equity Method Investments [Line Items]
Shares sold (shares) \| shares				5,717,184
Proceeds from sale of equity method investments				$ 108,512
Gain (loss) on sale of equity investments							$ 62,395
Joint Venture \| 61 9th Avenue
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage					45.10%
Joint Venture \| 512 West 22nd Street
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage		55.00%
Office and Retail Property \| 61 9th Avenue
Schedule of Equity Method Investments [Line Items]
Debt proceeds, net					$ 31,000
Maturing in January 2026 \| Office and Retail Property \| 61 9th Avenue
Schedule of Equity Method Investments [Line Items]
Loans repaid					$ 167,500
Square footage of real estate property (in sqft) \| ft²					166
Debt instrument, interest rate, stated percentage							3.07%
Debt term (years)	7 years
Maturing in 2021 \| Office and Retail Property \| 61 9th Avenue
Schedule of Equity Method Investments [Line Items]
Loans repaid						$ 90,000
Matures in June 2023 \| Office Building \| 512 West 22nd Street
Schedule of Equity Method Investments [Line Items]
Loans repaid		$ 145,700					$ 109,565
Square footage of real estate property (in sqft) \| ft²		173
Debt instrument, interest rate, stated percentage							3.72%
Debt term (years)		4 years
Length of extension available (years)		1 year
Matures in 2019 \| Office Building \| 512 West 22nd Street
Schedule of Equity Method Investments [Line Items]
Loans repaid			$ 126,000
LIBOR \| Maturing in January 2026 \| Office and Retail Property \| 61 9th Avenue
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)					1.35%
LIBOR \| Maturing in 2021 \| Office and Retail Property \| 61 9th Avenue
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)						3.05%
LIBOR \| Matures in June 2023 \| Office Building \| 512 West 22nd Street
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)		2.00%
LIBOR \| Matures in 2019 \| Office Building \| 512 West 22nd Street
Schedule of Equity Method Investments [Line Items]
Spread Over LIBOR (in percentage)			2.65%