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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 |

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