Debt Instrument, Weighted Average Maturity Period

No definition available.

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Period Type:	duration

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 944
-SubTopic 210
-Section S99
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-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt premium.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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+ Details

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Period Type:	instant

Notes Payable - Terms of Notes Payable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Mar. 25, 2019	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 2,160,293	$ 2,218,093
Unamortized premium	7,574	11,239
Unamortized loan costs	(5,148)	(6,357)
Total Notes Payable	$ 2,162,719	2,222,975
Weighted average maturity period of notes payable outstanding	4 years 7 months 6 days
Credit Facility, Unsecured
Debt Instrument [Line Items]
Interest Rate	1.19%
Long-term debt	$ 232,400	251,500
Term Loan, Unsecured
Debt Instrument [Line Items]
Interest Rate	1.34%
Long-term debt	$ 250,000	250,000
Senior Notes, Unsecured
Debt Instrument [Line Items]
Long-term debt	$ 1,482,400	1,501,500
Senior Notes, Unsecured \| 3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.95%
Long-term debt	$ 275,000	275,000
Senior Notes, Unsecured \| 3.91% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.91%			3.91%
Long-term debt	$ 250,000	250,000
Senior Notes, Unsecured \| 3.86% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.86%
Long-term debt	$ 250,000	250,000
Senior Notes, Unsecured \| 3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.78%
Long-term debt	$ 125,000	125,000
Senior Notes, Unsecured \| 4.09% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	4.09%			4.09%
Long-term debt	$ 100,000	100,000
Mortgage Debt
Debt Instrument [Line Items]
Long-term debt	677,893	716,593
Total Notes Payable	$ 677,900
Mortgage Debt \| Fifth Third Center
Debt Instrument [Line Items]
Interest Rate	3.37%
Long-term debt	$ 137,057	140,332
Mortgage Debt \| Terminus 100
Debt Instrument [Line Items]
Interest Rate	5.25%
Long-term debt	$ 114,997	118,146
Mortgage Debt \| Colorado Tower
Debt Instrument [Line Items]
Interest Rate	3.45%
Long-term debt	$ 114,660	117,085
Mortgage Debt \| Promenade
Debt Instrument [Line Items]
Interest Rate	4.27%
Long-term debt	$ 92,593	95,986
Mortgage Debt \| 816 Congress
Debt Instrument [Line Items]
Interest Rate	3.75%
Long-term debt	$ 78,232	79,987
Mortgage Debt \| Terminus 200
Debt Instrument [Line Items]
Interest Rate	3.79%
Long-term debt	$ 74,354	76,079
Mortgage Debt \| Legacy Union One
Debt Instrument [Line Items]
Interest Rate			4.24%
Long-term debt		66,000	$ 66,000
Mortgage Debt \| Meridian Mark Plaza
Debt Instrument [Line Items]
Interest Rate	6.00%
Long-term debt	$ 0	$ 22,978