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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other investments | [1] | $ 1,237,295 |  | $ 1,176,560
Earnings (losses) from equity method investments |  | 12,769 | $ 16,612 |
Interest expense |  | 39,563 | 43,392 |
Mark-to-market gain |  | $ 5,100 | 9,900 |
SAFE |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of shares owned (in shares) |  | 34.8 |  |
Closing price (in dollars per share) |  | $ 70.10 |  |
Market value |  | $ 2,400,000 |  |
Dilution gain |  | 500 | 7,900 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other investments |  | 1,237,295 |  | 1,176,560
Earnings (losses) from equity method investments |  | 12,769 | 16,612 |
Depreciation expense |  | 5,600 | 4,000 |
Interest expense |  | 15,500 | 13,700 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other strategic investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other investments |  | 127,972 |  | 69,911
Earnings (losses) from equity method investments |  | 958 | (837) |
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying value |  | 1,109,323 |  | 1,106,649
Earnings (losses) from equity method investments |  | 11,811 | 17,449 |
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | SAFE |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying value |  | 955,758 |  | 937,712
Earnings (losses) from equity method investments |  | 11,412 | 19,338 |
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | iStar Net Lease II LLC (Net Lease Venture II) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying value |  | 84,481 |  | 78,998
Earnings (losses) from equity method investments |  | 1,001 | 193 |
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other real estate equity investments |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Carrying value |  | 69,084 |  | $ 89,939
Earnings (losses) from equity method investments |  | $ (602) | $ (2,082) |
[1] | (1)Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").

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