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Debt (Senior Notes, Term Loans, and Revolver) (Details)	1 Months Ended	3 Months Ended
Debt (Senior Notes, Term Loans, and Revolver) (Details)	Sep. 30, 2021 USD ($)	Mar. 31, 2022 USD ($) asset $ / shares	Dec. 31, 2021 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 $ / shares	Apr. 30, 2022 USD ($)
Debt
unamortized debt issuance costs on bonds		$ (12,466,000)	$ (13,058,000)
Debt, net		2,210,725,000	2,409,438,000
Unsecured Debt, Gross		818,662,000	1,018,662,000
Unamortized debt issuance costs on term loans		(3,223,000)	$ (3,658,000)
Debt Instrument, Covenant, Minimum Liquidity Level		$ 125,000,000.0
Dividends \| $ / shares		$ 0.01	$ 0.01		$ 0.33
Leverage ratio		0.0700
Amortization of deferred financing costs		$ 1,684,000		$ 1,321,000
Secured Debt [Member]
Debt
Number of Assets Encumbered \| asset		15
The Revolver \| Line of Credit
Debt
Maximum borrowing capacity		$ 600,000,000
Additional maturity term		1 year
Unsecured Debt		$ 0	$ 200,000,000
Interest Rate		2.95%
Remaining borrowing capacity		$ 600,000,000	400,000,000
$400 Million Term Loan Maturing 2023 \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity		400,000,000
Unsecured Debt		$ 203,944,000	203,944,000
Interest Rate		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
Unsecured Debt		$ 114,718,000	114,718,000
Interest Rate		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
Unsecured Debt		$ 100,000,000	100,000,000
Interest Rate		4.18%
$400 Million Term Loan Maturing 2025 [Member] \| Unsecured Debt [Member]
Debt
Maximum borrowing capacity		$ 400,000,000
Unsecured Debt		$ 400,000,000	400,000,000
Interest Rate		4.00%
Conventional Mortgage Loan
Debt
Unsecured Debt		$ 815,439,000	815,004,000
$500 Million Senior Notes Due 2026 \| Unsecured Debt [Member]
Debt
Debt Instrument, Interest Rate, Stated Percentage		3.75%
Senior Notes [Member]
Debt
Long-term Debt, Gross		$ 987,534,000	986,942,000
$500 Million Senior Notes Due 2029 \| Unsecured Debt [Member]
Debt
Debt Instrument, Interest Rate, Stated Percentage		4.00%
Revolver And Term Loan Amendment \| Line of Credit \| Subsequent Event [Member]
Debt
Maximum borrowing capacity						$ 50,000,000
Prepaid expenses and other assets
Debt
Deferred financing costs		$ 2,600,000	2,900,000
Fair Value, Inputs, Level 3 [Member] \| Secured Debt [Member]
Debt
Secured Debt		407,752,000	407,492,000
Fair Value, Inputs, Level 3 [Member] \| Unsecured Debt [Member]
Debt
Unsecured Debt		815,439,000	1,015,004,000
Level 1 \| Senior Notes [Member]
Debt
Long-term Debt, Gross		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
Level 1 \| $500 Million Senior Notes Due 2026
Debt
Long-term Debt, Gross		$ 500,000,000	$ 500,000,000