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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Debt (Senior Notes, Term Loans, and Revolver) (Details)	1 Months Ended	3 Months Ended		6 Months Ended
Debt (Senior Notes, Term Loans, and Revolver) (Details)	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) asset	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) asset	Jun. 30, 2021 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt
unamortized debt issuance costs on bonds		$ (11,875,000)		$ (11,875,000)			$ (13,058,000)
Debt, net		2,211,735,000		2,211,735,000			2,409,438,000
Unsecured Debt, Gross		818,662,000		818,662,000			1,018,662,000
Unamortized debt issuance costs on term loans		(2,785,000)		(2,785,000)			(3,658,000)
Amortization of deferred financing costs		$ 1,417,000	$ 1,364,000	$ 3,101,000	$ 2,685,000
Secured Debt [Member]
Debt
Number of Assets Encumbered \| asset		15		15
The Revolver \| Line of Credit
Debt
Maximum borrowing capacity		$ 600,000,000		$ 600,000,000
Additional maturity term				1 year
Unsecured Debt		$ 0		$ 0			200,000,000
Interest Rate		4.29%		4.29%
Remaining borrowing capacity		$ 600,000,000		$ 600,000,000			400,000,000
$400 Million Term Loan Maturing 2023 \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity		400,000,000		400,000,000
Unsecured Debt		$ 203,944,000		$ 203,944,000			203,944,000
Interest Rate		4.69%		4.69%
Extension Option	$ 151,700,000
Extension period	1 year
$225 Million Term Loan Maturing 2023 \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity		$ 225,000,000		$ 225,000,000
Unsecured Debt		$ 114,718,000		$ 114,718,000			114,718,000
Interest Rate		4.27%		4.27%
Extension Option	$ 73,000,000
Extension period	1 year
$150 Million Term Loan Maturing 2023 \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity		$ 150,000,000		$ 150,000,000
Unsecured Debt		$ 100,000,000		$ 100,000,000			100,000,000
Interest Rate		4.18%		4.18%
Extension period	1 year
$400 Million Term Loan Maturing 2025 [Member] \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity		$ 400,000,000		$ 400,000,000
Unsecured Debt		$ 400,000,000		$ 400,000,000			400,000,000
Interest Rate		4.00%		4.00%
Conventional Mortgage Loan
Debt
Unsecured Debt		$ 815,877,000		$ 815,877,000			815,004,000
$500 Million Senior Notes Due 2026 \| Unsecured Debt [Member]
Debt
Debt Instrument, Interest Rate, Stated Percentage		3.75%		3.75%
Senior Notes [Member]
Debt
Long-term Debt, Gross		$ 988,125,000		$ 988,125,000			986,942,000
$500 Million Senior Notes Due 2029 \| Unsecured Debt [Member]
Debt
Debt Instrument, Interest Rate, Stated Percentage		4.00%		4.00%
Revolver And Term Loan Amendment \| Line of Credit
Debt
Maximum borrowing capacity						$ 50,000,000
Prepaid expenses and other assets
Debt
Deferred financing costs		$ 2,300,000		$ 2,300,000			2,900,000
Fair Value, Inputs, Level 3 [Member] \| Secured Debt [Member]
Debt
Secured Debt		407,733,000		407,733,000			407,492,000
Fair Value, Inputs, Level 3 [Member] \| Unsecured Debt [Member]
Debt
Unsecured Debt		815,877,000		815,877,000			1,015,004,000
Level 1 \| Senior Notes [Member]
Debt
Long-term Debt, Gross		1,000,000,000		1,000,000,000			1,000,000,000
Level 1 \| $500 Million Senior Notes Due 2029
Debt
Long-term Debt, Gross		500,000,000		500,000,000			500,000,000
Level 1 \| $500 Million Senior Notes Due 2026
Debt
Long-term Debt, Gross		$ 500,000,000		$ 500,000,000			$ 500,000,000