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Summary of Significant Accounting Policies (Discontinued Operations - Net Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from discontinued operations | $ 52,037 | $ 21,614 | $ 25,315 | $ 22,486 | $ 24,143 | $ 20,833 | $ 21,661 | $ 18,818 | $ 121,452 | [1] | $ 85,455 | [1] | $ 489,900 | [1]
Net (income) from discontinued operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (5,620) |  | (11,251) |  | (10,730) |
Net income (loss) attributable to iStar Inc. |  |  |  |  |  |  |  |  | 132,481 |  | (42,441) |  | 324,042 |
Discontinued Operations - Held for Sale | Net Lease Business Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating lease income |  |  |  |  |  |  |  |  | 164,811 |  | 164,446 |  | 174,094 |
Interest income |  |  |  |  |  |  |  |  | 3,717 |  | 3,440 |  | 2,018 |
Interest income from sales-type leases |  |  |  |  |  |  |  |  | 35,826 |  | 33,552 |  | 20,496 |
Other income |  |  |  |  |  |  |  |  | 5,178 |  | 5,412 |  | 9,183 |
Total revenues |  |  |  |  |  |  |  |  | 209,532 |  | 206,850 |  | 205,791 |
Interest expense |  |  |  |  |  |  |  |  | 43,232 |  | 42,746 |  | 42,220 |
Real estate expense |  |  |  |  |  |  |  |  | 27,366 |  | 26,410 |  | 24,589 |
Depreciation and amortization |  |  |  |  |  |  |  |  | 52,221 |  | 50,765 |  | 51,083 |
(Recovery of) provision for loan losses |  |  |  |  |  |  |  |  | (1,150) |  | 186 |  |  |
(Recovery of) provision for losses on net investment in leases |  |  |  |  |  |  |  |  | (10,871) |  | 1,760 |  |  |
Impairment of assets |  |  |  |  |  |  |  |  | 2,286 |  | 2,036 |  | 2,471 |
Other expense |  |  |  |  |  |  |  |  | 16,476 |  |  |  |  |
Total costs and expenses |  |  |  |  |  |  |  |  | 129,560 |  | 123,903 |  | 120,363 |
Income from sales of real estate |  |  |  |  |  |  |  |  | 8,476 |  |  |  | 224,654 |
Income from discontinued operations before earnings from equity method investments and other items |  |  |  |  |  |  |  |  | 88,448 |  | 82,947 |  | 310,082 |
Earnings from equity method investments |  |  |  |  |  |  |  |  | 8,123 |  | 2,654 |  | (529) |
Selling profit from sales-type leases |  |  |  |  |  |  |  |  | 25,034 |  |  |  | 180,416 |
Net income from discontinued operations before income taxes |  |  |  |  |  |  |  |  | 121,605 |  | 85,601 |  | 489,969 |
Income tax expense |  |  |  |  |  |  |  |  | (153) |  | (146) |  | (69) |
Net income from discontinued operations |  |  |  |  |  |  |  |  | 121,452 |  | 85,455 |  | 489,900 |
Net (income) from discontinued operations attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (5,620) |  | (11,251) |  | (10,730) |
Net income (loss) attributable to iStar Inc. |  |  |  |  |  |  |  |  | 115,832 |  | 74,204 |  | 479,170 |
Discontinued Operations - Held for Sale | Net Lease Business Segment | SAFE |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate expense |  |  |  |  |  |  |  |  | $ 8,400 |  | $ 8,200 |  | $ 5,000 |
[1] | Refer to Note 3 – Net Lease Sale and Discontinued Operations.

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