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Other Investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Other investments	$ 733,793		$ 733,793		$ 304,275
Equity in Earnings (Losses)	7,617	$ (635)	16,566	$ (4,581)
Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Realized Gain (Loss) on Disposal	8,200
Other strategic investments
Schedule of Equity Method Investments [Line Items]
Other investments	44,413		44,413		7,516
Equity in Earnings (Losses)	195	652	162	(9,521)
Impairment on foreign equity method investment				10,000
Equity Method Investment, Realized Gain (Loss) on Disposal			8,200
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	689,380		689,380		296,759
Equity in Earnings (Losses)	7,422	(1,287)	16,404	4,940
Real estate equity investments | SAFE
Schedule of Equity Method Investments [Line Items]
Carrying value	581,059		581,059		149,589
Equity in Earnings (Losses)	2,946	775	14,076	2,927
Real estate equity investments | iStar Net Lease II LLC (Net Lease Venture II)
Schedule of Equity Method Investments [Line Items]
Carrying value	5,300		5,300		16,215
Equity in Earnings (Losses)	(98)	0	(416)	0
Real estate equity investments | iStar Net Lease I LLC (Net Lease Venture)
Schedule of Equity Method Investments [Line Items]
Carrying value	0		0		0
Equity in Earnings (Losses)	0	0	0	4,100
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Carrying value	103,021		103,021		$ 130,955
Equity in Earnings (Losses)	$ 4,574	$ (2,062)	$ 2,744	$ (2,087)

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- Definition

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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