Debt Instrument, Number of Instruments

No definition available.

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- Definition

Notes payable prepayment penalty

+ References

No definition available.

+ Details

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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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

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

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-Name Accounting Standards Codification
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Balance Type:	credit
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

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Period Type:	instant

- Definition

The carrying amount, as of the date of the latest financial statement presented, of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party.

+ References

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Period Type:	instant

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

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- Details

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Notes Payable (Mortgage Loan Information) (Details) ft² in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) debt_instrument	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ 2,258,000	$ (5,180,000)	$ 0
Outstanding amount	1,093,228,000	$ 1,380,920,000
San Jacinto Center
Debt Instrument [Line Items]
Interest rate on mortgage loan (percent)		6.048%
Two Buckhead Plaza
Debt Instrument [Line Items]
Interest rate on mortgage loan (percent)		6.43%
3344 Peachtree
Debt Instrument [Line Items]
Interest rate on mortgage loan (percent)		4.75%
Colorado Tower
Debt Instrument [Line Items]
Non-recourse mortgage loan		$ 120,000,000.0
Square footage of real estate property (square feet) \| ft²		373
Interest rate on mortgage loan (percent)		3.45%
Fifth Third Center
Debt Instrument [Line Items]
Non-recourse mortgage loan		$ 150,000,000.0
Square footage of real estate property (square feet) \| ft²		698
Interest rate on mortgage loan (percent)		3.37%
191 Peachtree Tower
Debt Instrument [Line Items]
Notes payable prepayment penalty		$ 3,700,000
Mortgage Debt
Debt Instrument [Line Items]
Outstanding amount	$ 498,800,000
Number of non-recourse mortgage loans \| debt_instrument	6
Mortgage Debt \| Colorado Tower
Debt Instrument [Line Items]
Interest rate on mortgage loan (percent)	3.45%
Mortgage Debt \| Fifth Third Center
Debt Instrument [Line Items]
Interest rate on mortgage loan (percent)	3.37%
Mortgage Debt \| 191 Peachtree Tower
Debt Instrument [Line Items]
Debt assumed that was repaid		$ 98,100,000
Mortgage Debt
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ 2,600,000
Assets pledged as security	585,700,000
Mortgage Debt \| One Eleven Congress
Debt Instrument [Line Items]
Amount of debt paid	128,000,000
Mortgage Debt \| San Jacinto Center
Debt Instrument [Line Items]
Amount of debt paid	101,000,000
Mortgage Debt \| Two Buckhead Plaza
Debt Instrument [Line Items]
Amount of debt paid	52,000,000
Mortgage Debt \| 3344 Peachtree
Debt Instrument [Line Items]
Amount of debt paid	77,900,000
Mortgage Debt \| ACS Center
Debt Instrument [Line Items]
Amount of debt paid	127,000,000
Gain (loss) on extinguishment of debt	$ (376,000)