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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Other investments | [1] | $ 1,275,954 |  | $ 1,275,954 |  | $ 1,176,560
Earnings (losses) from equity method investments |  | 12,697 | $ 2,586 | 25,466 | $ 19,198 |
Interest expense |  | $ 39,417 | 41,950 | 78,980 | 85,341 |
Mark-to-market gain |  |  |  | $ 5,100 | 9,900 |
Safehold Inc. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Number of shares owned (in shares) |  | 35.2 |  | 35.2 |  |
Closing price (in dollars per share) |  | $ 78.50 |  | $ 78.50 |  |
Market value |  | $ 2,800,000 |  | $ 2,800,000 |  |
Dilution gain |  |  |  | 500 | 7,900 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Other investments |  | 1,275,954 |  | 1,275,954 |  | 1,176,560
Earnings (losses) from equity method investments |  | 12,697 | 2,586 | 25,466 | 19,198 |
Depreciation expense |  | 5,500 | 4,800 | 11,100 | 8,800 |
Interest expense |  | 17,700 | 15,700 | 33,200 | 29,400 |
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Other strategic investments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Other investments |  | 133,612 |  | 133,612 |  | 69,911
Earnings (losses) from equity method investments |  | 2,856 | (1,321) | 3,814 | (2,158) |
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Carrying value |  | 1,142,342 |  | 1,142,342 |  | 1,106,649
Earnings (losses) from equity method investments |  | 9,841 | 3,907 | 21,652 | 21,356 |
Real estate equity investments | Equity Method Investment, Nonconsolidated Investee or Group of Investees | Safehold Inc. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Carrying value |  | 988,687 |  | 988,687 |  | 937,712
Earnings (losses) from equity method investments |  | 9,703 | 8,236 | 21,115 | 27,574 |
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 |  | 84,735 |  | 84,735 |  | 78,998
Earnings (losses) from equity method investments |  | 1,599 | 564 | 2,600 | 757 |
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 |  | 68,920 |  | 68,920 |  | $ 89,939
Earnings (losses) from equity method investments |  | $ (1,461) | $ (4,893) | $ (2,063) | $ (6,975) |
[1] | Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).

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