Notes Payable, Interest Expense and Commitments and Contingencies (Details Textual) (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 191 Peachtree Tower Mortgage Note [Member] sqft
Notes payable commitments and contingencies (Textual) [Abstract]
Debt Instrument, Issuance Date			March 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	553.3	568.5
Outstanding letters of credit and performance bonds	5.3
Outstanding commitments to fund real estate projects	12.9
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.

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- Definition

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

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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.

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

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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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Interest rate stated in the contractual debt agreement.

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Date when the debt instrument was issued, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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The total of future contractually required payments on leases defined as operating.

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The amount of square footage related to a real estate property.

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