Notes Payable and Derivatives (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative [Line Items]
Gain (loss) reclassification to interest expense		$ 620,000	$ 595,000	$ 1,843,000	$ 1,770,000
Amortization of debt costs				3,648,000	3,533,000
Interest rate cash flow hedge gain (loss) to be reclassified over next 12 months, net		2,321,000		2,321,000
Notes Payable Due October 2022
Derivative [Line Items]
Aggregate principal amount issued	$ 500,000,000
Interest Rate	5.60%
Notes Payable 2033
Derivative [Line Items]
Aggregate purchase price				488,380,000
Amortization of debt costs				11,620,000
Debt issuance costs		$ 4,450,000		$ 4,450,000
Discount interest rate		5.905%		5.905%
Net proceeds from debt issuance cost				$ 483,930,000
Loans Payable
Derivative [Line Items]
Debt issuance costs		$ 42,595,000		42,595,000		$ 38,145,000
Loans Payable | Notes Payable 2033
Derivative [Line Items]
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed	100.00%
AOCI, cash flow hedges
Derivative [Line Items]
Gain (loss) reclassification to interest expense				10,739,000
Accumulated Other Comprehensive Income (Loss)
Derivative [Line Items]
Gain (loss) reclassification to interest expense		$ 620,000	$ 595,000	$ 1,843,000	$ 1,770,000