Notes Payable - Terms of Notes Payable (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Notes payable, gross	$ 2,455,501	$ 2,341,841
Unamortized loan costs	(6,559)	(7,235)
Total Notes Payable	$ 2,448,942	2,334,606
Weighted average maturity of notes payable	3 years 9 months 18 days
Unsecured Notes
Debt Instrument [Line Items]
Notes payable, gross	$ 1,922,300	1,806,600
Credit Facility
Debt Instrument [Line Items]
Interest Rate	5.80%
Notes payable, gross	$ 172,300	56,600
Term Loan \| Term Loan Unsecured Due 2025
Debt Instrument [Line Items]
Interest Rate	5.95%
Notes payable, gross	$ 400,000	400,000
Term Loan \| Term Loan Unsecured Due 2024
Debt Instrument [Line Items]
Interest Rate	5.38%
Notes payable, gross	$ 350,000	350,000
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	$ 533,201	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	$ 129,276	130,168
Secured Mortgage Notes \| Colorado Tower
Debt Instrument [Line Items]
Interest Rate	3.45%
Notes payable, gross	$ 108,888	109,552
Secured Mortgage Notes \| Domain 10
Debt Instrument [Line Items]
Interest Rate	3.75%
Notes payable, gross	$ 74,037	$ 74,521

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

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
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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.

+ Details

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1D
-Subparagraph (a)
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-SubTopic 30
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-Paragraph 3
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Balance Type:	debit
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- Definition

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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+ Details

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Balance Type:	credit
Period Type:	instant