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Commitments, Contingencies and Guarantees (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Leases, Future Minimum Payments Due [Abstract]      
2012 $ 5,836,000    
2013 4,999,000    
2014 4,744,000    
2015 3,724,000    
2016 3,293,000    
Later years (through 2099) 13,538,000    
Total 36,134,000    
Operating Leases, Rent Expense 9,000,000 9,900,000 13,600,000
Partnership Interest [Member] | Unconsolidated Construction Joint Venture [Member]
     
Operating Leases, Future Minimum Payments Due [Abstract]      
Contract Value of Active Construction Joint Venture Projects 1,700,000,000    
Reporting Entitys Interest in Joint Venture [Member] | Unconsolidated Construction Joint Venture [Member]
     
Operating Leases, Future Minimum Payments Due [Abstract]      
Contract Value of Active Construction Joint Venture Projects 725,300,000    
Other Partners Interest in Joint Venture [Member] | Unconsolidated Construction Joint Venture [Member]
     
Operating Leases, Future Minimum Payments Due [Abstract]      
Contract Value of Active Construction Joint Venture Projects $ 927,200,000