Debt (Narrative) (Details) - USD ($) $ in Thousands				12 Months Ended
	Dec. 28, 2023	Jun. 01, 2023	Apr. 12, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Maximum amount of borrowings outstanding				$ 115,500	$ 330,000	$ 150,000
Weighted average amount of borrowings outstanding				$ 44,700	$ 80,300	$ 19,600
Weighted average interest rate before amortization of debt fees				5.90%	3.20%	0.90%
Line of credit facility, annual facility fee				$ 1,900
Revolving credit facility				$ 0	$ 0
Revolving credit facility | SOFR
Debt Instrument [Line Items]
Basis Spread on SOFR Interest				0.775%
Term Loan | SOFR
Debt Instrument [Line Items]
Basis Spread on SOFR Interest				0.85%
Hoboken (14 Buildings) | Mortgages Payable | Minimum
Debt Instrument [Line Items]
Interest rate				3.91%
Hoboken (14 Buildings) | Mortgages Payable | Maximum
Debt Instrument [Line Items]
Interest rate				5.00%
Senior 5 Point 375 Percent Notes | Senior Notes and Debentures
Debt Instrument [Line Items]
Proceeds from issuance of debt			$ 350,000
Interest rate			5.375%
Note offering percent			99.59%
Debt instrument, yield to maturity			5.468%
Net proceeds, after debt issuance costs			$ 345,700
2.75% notes | Senior Notes and Debentures
Debt Instrument [Line Items]
Interest rate		2.75%		2.75%
Repayment of 2.75% Senior note		$ 275,000
Bethesda Row | Mortgages Payable
Debt Instrument [Line Items]
Net proceeds, after debt issuance costs	$ 199,100
Issuance of mortgage loan	$ 200,000
Fixed interest rate of derivative instrument	5.03%			5.03%
Bethesda Row | Mortgages Payable | SOFR
Debt Instrument [Line Items]
Basis Spread on SOFR Interest	0.95%			0.95%