Mortgages and Notes Payable (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) extension	Dec. 31, 2021 USD ($) numberOfBuildings	Dec. 31, 2020 USD ($)	Jan. 27, 2023 USD ($)
Debt Instrument [Line Items]
Mortgages and notes payable, net	$ 3,197,215,000	$ 2,788,915,000
Less-unamortized debt issuance costs	(16,393,000)	(15,207,000)
Scheduled future principal payments [Abstract]
2023	7,069,000
2024	207,365,000
2025	393,176,000
2026	206,911,000
2027	458,929,000
Thereafter	1,940,158,000
Less-unamortized debt issuance costs	(16,393,000)	(15,207,000)
Mortgages and notes payable, net	3,197,215,000	2,788,915,000
Gains/(losses) on debt extinguishment	$ 0	(286,000)	$ (3,674,000)
Lender covenant compliance to accelerate outstanding borrowings	51.00%
Cross-default minimum threshold	$ 35,000,000
Holders covenant compliance of bonds	25.00%
Uncured covenant compliance default period	60 days
Maximum liquidity requirements	1 year
Capitalized Interest [Abstract]
Capitalized Interest	$ 4,000,000	$ 9,600,000	$ 8,300,000
Floating to Fixed Interest Rate Swaps (2017) [Member]
Scheduled future principal payments [Abstract]
Amount of borrowings outstanding, subject to swaps	$ 50,000,000
Underlying treasury rate term (in years)	1 month
Weighted average interest rate under derivative instruments (in hundredths)	1.693%
3.625% (3.752% effective rate) Notes due 2023 [Member]
Scheduled future principal payments [Abstract]
Principal amount of debt	$ 250,000,000
Stated interest rate (in hundredths)	3.625%
2.600% (2.645% effective rate) Notes due 2031 [Member]
Debt Instrument [Line Items]
Effective interest rate (in hundredths)			2.645%
Scheduled future principal payments [Abstract]
Principal amount of debt			$ 400,000,000
Stated interest rate (in hundredths)			2.60%
Debt issuance costs			$ 3,400,000
Original issuance discount			$ 1,600,000
Variable Rate Term Loan due 2026 [Member]
Scheduled future principal payments [Abstract]
Principal amount of debt	$ 200,000,000
Variable Rate Term Loan due 2027 [Member]
Scheduled future principal payments [Abstract]
Principal amount of debt	$ 150,000,000
Temporary reduction in interest rate due to sustainability goals (in hundredths)	0.01%
Debt issuance costs	$ 2,700,000
Variable Rate Term Loan due 2027 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Scheduled future principal payments [Abstract]
Interest rate	SOFR
Interest rate, basis spread (in hundredths)	0.95%
Variable Rate Term Loan due 2027 [Member] | SOFR Related Spread Adjustment [Member]
Scheduled future principal payments [Abstract]
Interest rate, basis spread (in hundredths)	0.10%
Variable Rate Term Loan due 2024 [Member]
Scheduled future principal payments [Abstract]
Number of additional maturity extensions | extension	1
Principal amount of debt	$ 200,000,000
Temporary reduction in interest rate due to sustainability goals (in hundredths)	0.01%
Term of debt instrument (in years)	2 years
Variable Rate Term Loan due 2024 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Scheduled future principal payments [Abstract]
Interest rate	SOFR
Interest rate, basis spread (in hundredths)	0.95%
Variable Rate Term Loan due 2024 [Member] | SOFR Related Spread Adjustment [Member]
Scheduled future principal payments [Abstract]
Interest rate, basis spread (in hundredths)	0.10%
Revolving Credit Facility due 2022 [Member]
Scheduled future principal payments [Abstract]
Maximum borrowing capacity on revolving credit facility	$ 750,000,000
Additional borrowing capacity on revolving credit facility	$ 200,000,000
Number of additional maturity extensions | extension	2
Term of optional extensions	6 months
Annual facility fee (in hundredths)	0.20%
Temporary reduction in interest rate due to sustainability goals (in hundredths)	0.01%
Amount outstanding on revolving credit facility	$ 386,000,000
Outstanding letters of credit on revolving credit facility	100,000
Unused borrowing capacity on revolving credit facility	$ 363,900,000
Revolving Credit Facility due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Scheduled future principal payments [Abstract]
Interest rate	LIBOR
Interest rate, basis spread (in hundredths)	0.90%
Revolving Credit Facility due 2022 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Scheduled future principal payments [Abstract]
Interest rate	SOFR
Interest rate, basis spread (in hundredths)	0.85%
Revolving Credit Facility due 2022 [Member] | SOFR Related Spread Adjustment [Member]
Scheduled future principal payments [Abstract]
Interest rate, basis spread (in hundredths)	0.10%
PAC Portfolio Acquisition [Member]
Debt Instrument [Line Items]
Effective interest rate (in hundredths)		3.54%
Scheduled future principal payments [Abstract]
Principal amount of debt		$ 403,000,000
Term of debt instrument (in years)		10 years 8 months 12 days
Debt issuance costs		$ 3,500,000
Number of loans assumed in acquisition | numberOfBuildings		4
Unsecured Bridge Facility Due 2022 [Member]
Scheduled future principal payments [Abstract]
Maximum borrowing capacity on revolving credit facility		$ 200,000,000
Interest rate, basis spread (in hundredths)		0.85%
Annual facility fee (in hundredths)		0.20%
Term of debt instrument (in years)		6 months
Debt issuance costs		$ 1,000,000
Gains/(losses) on debt extinguishment		$ (200,000)
Unsecured Bridge Facility Due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Scheduled future principal payments [Abstract]
Interest rate		LIBOR
3.20% (3.363% effective rate) Notes due 2021 [Member]
Scheduled future principal payments [Abstract]
Principal amount of debt		$ 150,000,000
Stated interest rate (in hundredths)			3.20%
Gains/(losses) on debt extinguishment		(100,000)
Early repayment of debt			$ 150,000,000
Purchase price of debt (in hundredths)			101.908%
Variable Rate Term Loan due 2022 [Member]
Scheduled future principal payments [Abstract]
Interest rate, basis spread (in hundredths)			1.10%
Gains/(losses) on debt extinguishment			$ (3,700,000)
Early repayment of debt			$ 100,000,000
Variable Rate Term Loan due 2022 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Scheduled future principal payments [Abstract]
Interest rate basis			LIBOR
Secured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	$ 483,988,000	491,942,000
Aggregate undepreciated book value of secured real estate assets	747,400,000
Annual repayments through principal amortization	6,400,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	483,988,000	491,942,000
Secured indebtedness [Member] | 4.27% (3.61% effective rate) mortgage loan due 2028 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	113,105,000	115,731,000
Unamortized premium	3,300,000	3,900,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	113,105,000	115,731,000
Secured indebtedness [Member] | 4.0% Mortgage Loan Due 2029 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	89,204,000	91,318,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	89,204,000	91,318,000
Secured indebtedness [Member] | 3.61% (3.19% effective rate) mortgage loan due 2029 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	84,666,000	84,973,000
Unamortized premium	2,000,000	2,300,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	84,666,000	84,973,000
Secured indebtedness [Member] | 3.40% (3.50% effective rate) mortgage loan due 2033 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	69,473,000	69,422,000
Unamortized discount	500,000	600,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	69,473,000	69,422,000
Secured indebtedness [Member] | 4.60% (3.73% effective rate) mortgage loan due 2037 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	127,540,000	130,498,000
Unamortized premium	9,300,000	10,000,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	127,540,000	130,498,000
Unsecured indebtedness [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	2,729,620,000	2,312,180,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	2,729,620,000	2,312,180,000
Unsecured indebtedness [Member] | 3.625% (3.752% effective rate) Notes due 2023 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	0	249,726,000
Unamortized discount		300,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	0	249,726,000
Unsecured indebtedness [Member] | 3.875% (4.038% effective rate) Notes due 2027 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	298,334,000	297,934,000
Unamortized discount	1,700,000	2,100,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	298,334,000	297,934,000
Unsecured indebtedness [Member] | 4.125% (4.271% effective rate) Notes due 2028 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	347,863,000	347,449,000
Unamortized discount	2,100,000	2,600,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	347,863,000	347,449,000
Unsecured indebtedness [Member] | 4.20% (4.234% effective rate) Notes due 2029 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	349,386,000	349,288,000
Unamortized discount	600,000	700,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	349,386,000	349,288,000
Unsecured indebtedness [Member] | 3.050% (3.079% effective rate) Notes due 2030 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	399,302,000	399,204,000
Unamortized discount	700,000	800,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	399,302,000	399,204,000
Unsecured indebtedness [Member] | 2.600% (2.645% effective rate) Notes due 2031 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	398,735,000	398,579,000
Unamortized discount	1,300,000	1,400,000
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	398,735,000	398,579,000
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2026 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	$ 200,000,000	200,000,000
Effective interest rate (in hundredths)	5.34%
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	$ 200,000,000	200,000,000
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2027 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	$ 150,000,000	0
Effective interest rate (in hundredths)	5.34%
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	$ 150,000,000	0
Unsecured indebtedness [Member] | Variable Rate Term Loan due 2024 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	$ 200,000,000	0
Effective interest rate (in hundredths)	5.34%
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	$ 200,000,000	0
Unsecured indebtedness [Member] | Revolving Credit Facility due 2022 [Member]
Debt Instrument [Line Items]
Mortgages and notes payable, net	$ 386,000,000	70,000,000
Effective interest rate (in hundredths)	5.24%
Scheduled future principal payments [Abstract]
Mortgages and notes payable, net	$ 386,000,000	$ 70,000,000
Subsequent Event [Member] | Revolving Credit Facility due 2022 [Member]
Scheduled future principal payments [Abstract]
Amount outstanding on revolving credit facility				$ 392,000,000
Outstanding letters of credit on revolving credit facility				100,000
Unused borrowing capacity on revolving credit facility				$ 357,900,000