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Land and Development (Acquisitions, Dispositions, Impairments) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
a
Sep. 30, 2018
USD ($)
a
property
Sep. 30, 2017
USD ($)
a
Property, Plant and Equipment [Line Items]          
Increase in net lease assets upon consolidation of equity method investment       $ 844,550 $ 0
Revenues $ 122,141   $ 119,872 $ 657,956 $ 576,059
Number of land parcels sold | property       2  
Area of land parcels sold (acres) | a       93  
Prince George's County, Maryland          
Property, Plant and Equipment [Line Items]          
Land subject to litigation (acres) | a     1,250   1,250
Land development          
Property, Plant and Equipment [Line Items]          
Revenues 12,309   $ 25,962 $ 369,665 $ 178,722
Cost of sales expense $ 12,114   $ 27,512 318,881 165,888
Land development | Prince George's County, Maryland          
Property, Plant and Equipment [Line Items]          
Revenues         114,000
Cost of sales expense         106,300
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
Foreclosure | Land & Development          
Property, Plant and Equipment [Line Items]          
Increase in net lease assets upon consolidation of equity method investment       $ 4,600