Notes Payable - Terms of Notes Payable (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 2,240,025	$ 2,160,293
Unamortized premium	3,910	7,574
Unamortized loan costs	(6,426)	(5,148)
Total Notes Payable	$ 2,237,509	2,162,719
Weighted average maturity period of notes payable outstanding	3 years 10 months 24 days
Credit Facility, Unsecured
Debt Instrument [Line Items]
Interest Rate	1.15%
Long-term debt	$ 228,500	232,400
Term Loan, Unsecured
Debt Instrument [Line Items]
Interest Rate	1.15%
Long-term debt	$ 350,000	250,000
Senior Notes, Unsecured
Debt Instrument [Line Items]
Long-term debt	$ 1,578,500	1,482,400
Senior Notes, Unsecured \| 2019 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.95%
Long-term debt	$ 275,000	275,000
Senior Notes, Unsecured \| 2017 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.91%
Long-term debt	$ 250,000	250,000
Senior Notes, Unsecured \| 2019 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.86%
Long-term debt	$ 250,000	250,000
Senior Notes, Unsecured \| 2019 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.78%
Long-term debt	$ 125,000	125,000
Senior Notes, Unsecured \| 2017 Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	4.09%
Long-term debt	$ 100,000	100,000
Mortgage Debt
Debt Instrument [Line Items]
Long-term debt	661,525	677,893
Total Notes Payable	$ 661,500
Mortgage Debt \| Fifth Third Center
Debt Instrument [Line Items]
Interest Rate	3.37%
Long-term debt	$ 133,672	137,057
Mortgage Debt \| Colorado Tower
Debt Instrument [Line Items]
Interest Rate	3.45%
Long-term debt	$ 112,150	114,660
Mortgage Debt \| Terminus 100
Debt Instrument [Line Items]
Interest Rate	5.25%
Long-term debt	$ 111,678	114,997
Mortgage Debt \| Promenade
Debt Instrument [Line Items]
Interest Rate	4.27%
Long-term debt	$ 89,052	92,593
Mortgage Debt \| Domain 10
Debt Instrument [Line Items]
Interest Rate	3.75%
Long-term debt	$ 76,412	78,232
Mortgage Debt \| Terminus 200
Debt Instrument [Line Items]
Interest Rate	3.79%
Long-term debt	$ 72,561	74,354
Mortgage Debt \| Legacy Union One
Debt Instrument [Line Items]
Interest Rate	4.24%
Long-term debt	$ 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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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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