Summary Of Significant Accounting Policies (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Separate Unrestricted Cash For Deferred Compensation Plan.	$ 40,900		$ 40,900		$ 39,400
Gains from investments in securities	2,600	$ 315	2,235	$ 2,587
Prepaid Expense and Other Assets	89,624		89,624		70,839
Unsecured commercial paper	$ 750,000		$ 750,000		500,000
Number of VIEs	12		12
Commercial Paper
Summary Of Significant Accounting Policies [Line Items]
Unsecured commercial paper	$ 750,000		$ 750,000
Unconsolidated Joint Ventures [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of VIEs	3		3
Deferred Compensation, Excluding Share-Based Payments and Retirement Benefits
Summary Of Significant Accounting Policies [Line Items]
Gains from investments in securities	$ 2,600	$ 300	$ 2,200	$ 2,600
Environmental Focused Investment Fund
Summary Of Significant Accounting Policies [Line Items]
Prepaid Expense and Other Assets	8,600		8,600		7,100
Variable Interest Entity, Primary Beneficiary [Member]
Summary Of Significant Accounting Policies [Line Items]
Prepaid Expense and Other Assets	$ 18,569		$ 18,569		$ 15,036
Number of VIEs	9		9
Commercial Real Estate Properties [Member] \| Variable Interest Entity, Primary Beneficiary [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of VIEs	6		6