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Land and Development (Acquisitions, Dispositions, and Redeemable Noncontrolling Interest) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
a
parcel
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jan. 22, 2015
a
Property, Plant and Equipment [Line Items]            
Number of land parcels sold | parcel     1      
Area of land parcels sold | a     1,250      
Land development revenue $ 132,710,000 $ 27,888,000 $ 152,760,000 $ 42,835,000    
Land development cost of sales $ 122,466,000 17,262,000 $ 138,376,000 28,838,000    
Noncontrolling interest increase (percent)         10.70%  
Noncontrolling interest, decrease from redemptions or purchase of interests         $ 10,800,000  
Noncontrolling interest, ownership percentage by parent 95.70%   95.70%      
Impairment of assets $ 10,284,000 $ 3,012,000 $ 14,696,000 $ 3,012,000    
Redeemable noncontrolling interests 3,585,000   3,585,000   5,031,000  
Land & Development            
Property, Plant and Equipment [Line Items]            
Impairment of assets     10,100,000      
Not Currently Redeemable            
Property, Plant and Equipment [Line Items]            
Redeemable noncontrolling interests 0   0   $ 1,300,000  
Lennar            
Property, Plant and Equipment [Line Items]            
Area of land subject to litigation (in acres) | a           1,250
Prince George's County, Maryland            
Property, Plant and Equipment [Line Items]            
Land development revenue 114,000,000   114,000,000      
Land development cost of sales $ 106,300,000   $ 106,300,000