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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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