Notes Payable Notes Other (Details) $ in Thousands	3 Months Ended	9 Months Ended
Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($) ft²	Sep. 30, 2016 USD ($) ft²	Dec. 31, 2015 USD ($) ft²
Debt Instrument [Line Items]
Document Period End Date			Sep. 30, 2016
Area of Real Estate Property \| ft²		1,200,000	1,200,000	129,000
Long-term Debt, Gross		$ 792,866	$ 792,866	$ 721,293
Debt Issuance Costs, Net		3,488	3,488	(2,483)
Long-term Debt		789,378	789,378	718,810
Colorado Tower Mortgage Note [Member]
Debt Instrument [Line Items]
Mortgage Loans on Real Estate, Face Amount of Mortgages		$ 120,000	$ 120,000
Area of Real Estate Property \| ft²		373,000	373,000
Debt Instrument, Interest Rate, Stated Percentage		3.45%	3.45%
Debt Instrument, Maturity Date		Sep. 01, 2026
Long-term Debt		$ 120,000	$ 120,000	0
Fifth Third Center Mortgage Note [Member]
Debt Instrument [Line Items]
Mortgage Loans on Real Estate, Face Amount of Mortgages		$ 150,000	$ 150,000
Area of Real Estate Property \| ft²		698,000	698,000
Debt Instrument, Interest Rate, Stated Percentage		3.37%	3.37%
Debt Instrument, Maturity Date		Oct. 01, 2026
Long-term Debt		$ 150,000	$ 150,000	0
191 Peachtree Tower Mortgage Note [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		3.35%	3.35%
Notes payable prepayment penalty	$ 3,700
Long-term Debt		$ 99,188	$ 99,188	$ 100,000

Notes payable prepayment penalty

No definition available.

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- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

+ 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

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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- Definition

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

+ References

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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

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ 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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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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

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- Definition

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

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