Debt (Principal repayments required in the next five years) (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Mortgages Payable
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
2022	$ 1,046,600
2023	3,198,400
2024	773,215
2025	331,000
2026	0
Thereafter	750,000
Unsecured Debt
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]
2022	0
2023	575,000
2024	800,000
2025	450,000
2026	400,000
Thereafter	$ 350,000

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