Notes Payable - Terms of Notes Payable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Apr. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Notes payable, gross	$ 2,429,641		$ 2,341,841
Unamortized loan costs	(5,880)		(7,235)
Total Notes Payable	$ 2,423,761		2,334,606
Weighted average maturity of notes payable	3 years 6 months
Unsecured Notes
Debt Instrument [Line Items]
Notes payable, gross	$ 1,898,500		1,806,600
Credit Facility
Debt Instrument [Line Items]
Interest Rate	6.09%
Notes payable, gross	$ 148,500		56,600
Term Loan | Term Loan Unsecured Due 2025
Debt Instrument [Line Items]
Notes payable, gross	$ 400,000		400,000
Term Loan | Term Loan Unsecured Due 2025
Debt Instrument [Line Items]
Interest Rate	5.45%
Term Loan | Term Loan Unsecured Due 2025
Debt Instrument [Line Items]
Interest Rate	6.24%
Term Loan | Term Loan Unsecured Due 2024
Debt Instrument [Line Items]
Interest Rate	5.38%
Notes payable, gross	$ 350,000		350,000
Senior Note
Debt Instrument [Line Items]
Debt amount	$ 1,000,000
Senior Note | Senior Note, Unsecured Due 2029
Debt Instrument [Line Items]
Interest Rate	3.95%
Notes payable, gross	$ 275,000		275,000
Debt amount	$ 275,000
Senior Note | Senior Note, Unsecured Due 2025
Debt Instrument [Line Items]
Interest Rate	3.91%
Notes payable, gross	$ 250,000		250,000
Debt amount	$ 250,000
Senior Note | Senior Note, Unsecured Due 2028
Debt Instrument [Line Items]
Interest Rate	3.86%
Notes payable, gross	$ 250,000		250,000
Debt amount	$ 250,000
Senior Note | Senior Note, Unsecured Due 2027
Debt Instrument [Line Items]
Interest Rate	3.78%
Notes payable, gross	$ 125,000		125,000
Debt amount	$ 125,000
Senior Note | Senior Note, Unsecured Due 2027
Debt Instrument [Line Items]
Interest Rate	4.09%
Notes payable, gross	$ 100,000		100,000
Debt amount	100,000
Secured Mortgage Notes
Debt Instrument [Line Items]
Notes payable, gross	$ 531,141		535,241
Secured Mortgage Notes | Terminus
Debt Instrument [Line Items]
Interest Rate	6.34%
Notes payable, gross	$ 221,000		221,000
Secured Mortgage Notes | Terminus 100
Debt Instrument [Line Items]
Notes payable, gross	123,000
Secured Mortgage Notes | Terminus 200
Debt Instrument [Line Items]
Notes payable, gross	$ 98,000
Secured Mortgage Notes | Fifth Third Center
Debt Instrument [Line Items]
Interest Rate	3.37%
Notes payable, gross	$ 128,373		130,168
Secured Mortgage Notes | Colorado Tower
Debt Instrument [Line Items]
Interest Rate	3.45%
Notes payable, gross	$ 108,219		109,552
Secured Mortgage Notes | Domain 10
Debt Instrument [Line Items]
Interest Rate	3.75%
Notes payable, gross	$ 73,549		$ 74,521
Term Loan | 2025 Term Loan
Debt Instrument [Line Items]
Debt amount		$ 400,000
Term Loan | 2025 Term Loan | Interest Rate Swap
Debt Instrument [Line Items]
Debt amount		$ 200,000