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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 |

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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