Notes Payable - Terms of Notes Payable (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Notes payable, gross	$ 2,352,327	$ 2,240,025
Unamortized premium	2,994	3,910
Unamortized loan costs	(5,837)	(6,426)
Total Notes Payable	$ 2,349,484	2,237,509
Weighted average maturity of notes payable	3 years 6 months
Unsecured Notes
Debt Instrument [Line Items]
Notes payable, gross	$ 1,695,000	1,578,500
Credit Facility, Unsecured
Debt Instrument [Line Items]
Interest Rate	1.50%
Notes payable, gross	$ 345,000	228,500
Term Loan, Unsecured
Debt Instrument [Line Items]
Interest Rate	1.50%
Notes payable, gross	$ 350,000	350,000
Senior Notes, Unsecured \| 2019 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.95%
Notes payable, gross	$ 275,000	275,000
Senior Notes, Unsecured \| 2017 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.91%
Notes payable, gross	$ 250,000	250,000
Senior Notes, Unsecured \| 2019 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.86%
Notes payable, gross	$ 250,000	250,000
Senior Notes, Unsecured \| 2019 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.78%
Notes payable, gross	$ 125,000	125,000
Senior Notes, Unsecured \| 2017 Senior Notes, Unsecured
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	$ 657,327	661,525
Secured Mortgage Notes \| Fifth Third Center
Debt Instrument [Line Items]
Interest Rate	3.37%
Notes payable, gross	$ 132,807	133,672
Secured Mortgage Notes \| Colorado Tower
Debt Instrument [Line Items]
Interest Rate	3.45%
Notes payable, gross	$ 111,508	112,150
Secured Mortgage Notes \| Terminus 100
Debt Instrument [Line Items]
Interest Rate	5.25%
Notes payable, gross	$ 110,821	111,678
Secured Mortgage Notes \| Promenade
Debt Instrument [Line Items]
Interest Rate	4.27%
Notes payable, gross	$ 88,143	89,052
Secured Mortgage Notes \| Domain 10
Debt Instrument [Line Items]
Interest Rate	3.75%
Notes payable, gross	$ 75,945	76,412
Secured Mortgage Notes \| Terminus 200
Debt Instrument [Line Items]
Interest Rate	3.79%
Notes payable, gross	$ 72,103	72,561
Secured Mortgage Notes \| Legacy Union One
Debt Instrument [Line Items]
Interest Rate	4.24%
Notes payable, gross	$ 66,000	$ 66,000

Debt Instrument, Weighted Average Maturity Period

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt premium.

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- Definition

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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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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