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Land and Development (Acquisitions, Dispositions, Impairments) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) a | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) a parcel land_asset | Dec. 31, 2017 USD ($) a land_asset | Dec. 31, 2016 USD ($) real_estate_asset
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in net lease assets upon consolidation of equity method investment |  |  |  |  |  |  |  |  |  | $ 844,550 | $ 0 | $ 0
Revenue |  | $ 140,165 | $ 122,141 | $ 171,571 | $ 364,245 | $ 103,144 | $ 119,872 | $ 347,867 | $ 108,319 | $ 798,122 | 679,202 | 455,187
Number of land parcels sold | parcel |  |  |  |  |  |  |  |  |  | 2 |  |
Area of land parcels sold | a |  |  |  |  |  |  |  |  |  | 93 |  |
iStar's ownership percentage |  | 51.90% |  |  |  |  |  |  |  | 51.90% |  |
Income from sales of real estate | $ 24,500 |  |  |  |  |  |  |  |  | $ 126,004 | 92,049 | 105,296
Impairment of land and development assets |  |  |  |  |  |  |  |  |  | $ 56,700 | $ 20,500 | $ 3,800
Number of land and development assets impaired | land_asset |  |  |  |  |  |  |  |  |  | 5 | 1 |
Newly Formed Unconsolidated Entity |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
iStar's ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Income from sales of real estate |  |  |  |  |  |  |  |  |  |  |  | $ 8,800
Prince George's County, Maryland |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Land subject to litigation (in acres) | a |  |  |  |  |  | 1,250 |  |  |  |  | 1,250 |
Land |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate financing provided to buyers |  |  |  |  |  |  |  |  |  | $ 145,000 |  |
Proceeds of notes receivable |  |  |  |  |  |  |  |  |  | 81,200 |  |
Land development |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 409,710 | $ 196,879 | 88,340
Cost of sales expense |  |  |  |  |  |  |  |  |  | 350,181 | 180,916 | 62,007
Land development | Prince George's County, Maryland |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 114,000 |
Cost of sales expense |  |  |  |  |  |  |  |  |  |  | $ 106,300 |
Land | Real Estate Acquired in Satisfaction of Debt |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Increase in net lease assets upon consolidation of equity method investment |  |  |  |  |  |  |  |  |  | $ 4,600 |  | $ 40,600
Number of real estate properties acquired | real_estate_asset |  |  |  |  |  |  |  |  |  |  |  | 2

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