Notes Payable, Interest Expense and Commitments and Contingencies (Details Textual) (Details) (USD $) In Millions, unless otherwise specified			6 Months Ended
Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 191 Peachtree Tower Mortgage Note [Member] sqft
Notes payable commitments and contingencies (Textual) [Abstract]
Debt Instrument, Issuance Date			Mar. 28, 2012
Debt Instrument, Face Amount			$ 100
Square Footage of Real Estate Property			1,200,000
Interest rate on mortgage loan			3.35%
Date to Which Interest Only Payments are Made			May 01, 2016
Maturity date of debt instrument			Oct. 01, 2018
Debt Instrument, Fair Value Disclosure	483.7	568.5
Outstanding letters of credit and performance bonds	2.6
Outstanding commitments to fund real estate projects	13.3
Future lease commitments	$ 16.2

Date to Which Interest Only Payments are Made

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- Definition

Outstanding commitments to fund real estate projects.

+ References

No definition available.

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- Definition

Outstanding letters of credit and performance bonds as of the balance sheet date.

+ References

No definition available.

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- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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-Name Accounting Standards Codification

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-SubTopic 10

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-Subparagraph (a)

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- Definition

Interest rate stated in the contractual debt agreement.

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- Definition

Date the debt instrument was issued, in CCYY-MM-DD format.

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- Definition

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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-Name Statement of Financial Accounting Standard (FAS)

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