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Summary of Significant Accounting Policies (New Accounting Pronouncements) (Details) - USD ($) $ in Thousands		Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt obligations, net	[1]		$ 3,286,975	$ 3,387,080
Total iStar Inc. shareholders' equity	[1]		$ 870,969	$ 1,040,422
Forecast | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt obligations, net		$ 10,000
Total iStar Inc. shareholders' equity		$ (10,000)
[1] Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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