Notes Payable - Terms of notes payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Apr. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Notes payable, gross	$ 2,462,068		$ 2,341,841
Unamortized loan costs	(4,441)		(7,235)
Total Notes Payable	$ 2,457,627		2,334,606
Weighted average maturity of notes payable	3 years
Unsecured Notes
Debt Instrument [Line Items]
Notes payable, gross	$ 1,935,100		1,806,600
Credit Facility
Debt Instrument [Line Items]
Interest rate	6.31%
Notes payable, gross	$ 185,100		56,600
Term Loan, Unsecured Due In 2026 | Term Loan Unsecured Due 2025
Debt Instrument [Line Items]
Notes payable, gross	$ 400,000		400,000
Term Loan, Unsecured Due In 2026 | Term Loan Unsecured Due 2025
Debt Instrument [Line Items]
Interest rate	646.00%
Term Loan, Unsecured Due In 2026 | Floating Interest Rate of 6.46%.
Debt Instrument [Line Items]
Interest rate	5.45%
Term Loan, Unsecured Due In 2026 | Term Loan Unsecured Due 2024
Debt Instrument [Line Items]
Interest rate	5.38%
Notes payable, gross	$ 350,000		350,000
Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 1,000,000
Senior Notes, Unsecured | Senior Note, Unsecured Due 2029
Debt Instrument [Line Items]
Interest rate	3.95%
Notes payable, gross	$ 275,000		275,000
Senior Notes, Unsecured | Senior Note, Unsecured Due 2025
Debt Instrument [Line Items]
Interest rate	3.91%
Notes payable, gross	$ 250,000		250,000
Senior Notes, Unsecured | Senior Note, Unsecured Due 2028
Debt Instrument [Line Items]
Interest rate	3.86%
Notes payable, gross	$ 250,000		250,000
Senior Notes, Unsecured | Senior Note, Unsecured Due 2027
Debt Instrument [Line Items]
Interest rate	3.78%
Notes payable, gross	$ 125,000		125,000
Senior Notes, Unsecured | Senior Note, Unsecured Due 2027
Debt Instrument [Line Items]
Interest rate	4.09%
Notes payable, gross	$ 100,000		100,000
Secured Mortgage Notes
Debt Instrument [Line Items]
Notes payable, gross	526,968		535,241
Total Notes Payable	$ 527,000
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	$ 126,548		130,168
Secured Mortgage Notes | Colorado Tower
Debt Instrument [Line Items]
Interest rate	3.45%
Notes payable, gross	$ 106,862		109,552
Secured Mortgage Notes | Domain 10
Debt Instrument [Line Items]
Interest rate	3.75%
Notes payable, gross	$ 72,558		$ 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