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Basis of Presentation and Significant Accounting Policies (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Earnings attributable to restricted shareholders $ 0 $ 0 $ 0 $ 0  
Number of VIEs requiring consolidation         0
Land under Purchase Options, Recorded 30,037,000   30,037,000   50,781,000
Remaining purchase price of all land option agreements 656,200,000   656,200,000   670,500,000
Residential mortgage loans available-for-sale fair value 148,500,000   148,500,000   176,200,000
Residential mortgage loans available-for-sale outstanding principal balance 144,300,000   144,300,000   175,900,000
Net gain(loss) from change in fair value (1,900,000) 2,400,000 (1,400,000) 1,900,000  
Net gains from the sale of mortgages 12,300,000 20,300,000 25,100,000 35,100,000  
Reserves for servicing rights recognized 400,000   400,000   500,000
Servicing rights recognized 3,800,000 6,100,000 8,700,000 12,800,000  
Interest rate lock commitments, face value 174,800,000   174,800,000   99,000,000
Unexpired cash forward contracts 252,000,000   252,000,000   198,000,000
Whole loan investor commitments $ 35,600,000   $ 35,600,000   $ 59,000,000
Variability in future cash flows of derivative instruments in days     75    
Minimum [Member]
          
Period of reimbursement of payments on loan prepays, in days     90    
Maximum [Member]
          
Period of reimbursement of payments on loan prepays, in days     120