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Notes Payable, Interest Expense and Commitments and Contingencies (Details Textual) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 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 539.9 568.5  
Outstanding letters of credit and performance bonds 2.7    
Outstanding commitments to fund real estate projects 14.8    
Future lease commitments $ 15.9