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Other Income, Net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
OTHER INCOME, NET [Abstract] |  |  |  |  |  |  |  |
Rental income from Sogou | [1] |  | $ 10,427 |  | $ 9,793 |  | $ 8,029 |
Investment income |  |  | 6,352 |  | 3 |  | 3,004 |
Income from investments in financial instruments | [2] |  | 5,260 |  | 4,303 |  | 11,113 |
Individual tax refund and additional deduction of PRC value-added tax |  |  | 4,827 |  | 6,169 |  | 907 |
Write-down of unpaid long-term accounts payable |  |  | 1,276 |  | 47 |  | 0 |
Government grant |  |  | 418 |  | 5,928 |  | 5,763 |
Impairment loss on equity investments |  | $ (23,200) | (215) | [3] | (384) | [3] | (23,154) | [3]
Donations |  |  | (1,565) |  | (1,460) |  | (283) |
Others |  |  | 2,636 |  | 1,594 |  | 2,584 |
Total |  |  | $ 29,416 |  | $ 25,993 |  | $ 7,963 |
[1] | Sogou leases from Sohu, on an arms-length basis, office space at Sohu.com Internet Plaza under a lease that expires on December 31, 2022 and may be renewed subject to terms to be agreed to by Sohu and Sogou. The cash receipts from this lease within operating activities for 2021, 2020 and 2019 were $12.3 million, $12.1 million and $8.4 million, respectively.
[2] | The increase for 2021 compared to 2020 and the decrease for 2020 compared to 2019 were mainly due to income earned from investments in financial instruments.
[3] | In the fourth quarter of 2019, the Sohu Group recognized impairment losses of $23.2 million for equity investments.

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