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Land and Development (Acquisitions, Dispositions, Impairments) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
a
Jun. 30, 2018
USD ($)
a
property
Jun. 30, 2017
USD ($)
a
Property, Plant and Equipment [Line Items]        
Increase in net lease assets upon consolidation of equity method investment     $ 844,550 $ 0
Land development revenue $ 80,927 $ 132,710 $ 357,356 152,760
Number of land parcels sold | property     2  
Area of land parcels sold (acres) | a     93  
Land development cost of sales 83,361 122,466 $ 306,768 138,376
Prince George's County, Maryland        
Property, Plant and Equipment [Line Items]        
Land development revenue   114,000   114,000
Land development cost of sales   $ 106,300   $ 106,300
Land subject to litigation (acres) | a   1,250   1,250
Land & Development        
Property, Plant and Equipment [Line Items]        
Notes receivable issued for sale of land     145,000  
Proceeds from collection of notes receivable $ 81,200      
Impairment charges     1,300 $ 10,100
Land & Development | Foreclosure        
Property, Plant and Equipment [Line Items]        
Increase in net lease assets upon consolidation of equity method investment     $ 4,600