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

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
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-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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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

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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
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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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
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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))
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Period Type:	instant

Notes Payable - (Terms of Notes Payable) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Feb. 03, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Notes Payable, Gross	$ 1,931,883		$ 2,218,093
Unamortized premium	8,491		11,239
Unamortized loan costs	(5,469)		(6,357)
Total Notes Payable	$ 1,934,905		2,222,975
Weighted average maturity of notes payable	5 years 2 months 12 days
Unsecured Notes
Debt Instrument [Line Items]
Notes Payable, Gross	$ 1,250,000		$ 1,501,500
Credit Facility, Unsecured
Debt Instrument [Line Items]
Interest Rate			1.20%
Notes Payable, Gross	$ 0		$ 251,500
Term Loan, Unsecured
Debt Instrument [Line Items]
Interest Rate	1.35%
Notes Payable, Gross	$ 250,000		250,000
Senior Notes, Unsecured \| 3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.95%
Notes Payable, Gross	$ 275,000		275,000
Senior Notes, Unsecured \| 3.91% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.91%
Notes Payable, Gross	$ 250,000		250,000
Senior Notes, Unsecured \| 3.86% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.86%
Notes Payable, Gross	$ 250,000		250,000
Senior Notes, Unsecured \| 3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest Rate	3.78%
Notes Payable, Gross	$ 125,000		125,000
Senior Notes, Unsecured \| 4.09% 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	$ 681,883		716,593
Secured Mortgage Notes \| Fifth Third Center
Debt Instrument [Line Items]
Interest Rate	3.37%
Notes Payable, Gross	$ 137,886		140,332
Secured Mortgage Notes \| Terminus 100
Debt Instrument [Line Items]
Interest Rate	5.25%
Notes Payable, Gross	$ 115,800		118,146
Secured Mortgage Notes \| Colorado Tower
Debt Instrument [Line Items]
Interest Rate	3.45%
Notes Payable, Gross	$ 115,273		117,085
Secured Mortgage Notes \| Promenade
Debt Instrument [Line Items]
Interest Rate	4.27%
Notes Payable, Gross	$ 93,455		95,986
Secured Mortgage Notes \| 816 Congress
Debt Instrument [Line Items]
Interest Rate	3.75%
Notes Payable, Gross	$ 78,678		79,987
Secured Mortgage Notes \| Terminus 200
Debt Instrument [Line Items]
Interest Rate	3.79%
Notes Payable, Gross	$ 74,791		76,079
Secured Mortgage Notes \| Legacy Union One
Debt Instrument [Line Items]
Interest Rate	4.24%
Notes Payable, Gross	$ 66,000		$ 66,000
Secured Mortgage Notes \| Meridian Mark Plaza
Debt Instrument [Line Items]
Interest Rate			6.00%
Notes Payable, Gross	$ 0	$ 23,000	$ 22,978