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Fair Value Measurements (Short-term Investments, Long-term Investments and Long-term Time Deposits) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | [1]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in financial instruments |  | $ 399,345 |  | $ 100,745 |  |
Impairment loss | $ 23,200 | $ 215 | [1] | 384 | [1] | $ 23,154
Time deposit [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted investment maturity period |  | 3 months |  |  |  |
Time deposit [Member] | Maximum [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted investment maturity period |  | 1 year |  |  |  |
Long Term Time Deposit [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Restricted investment maturity period |  | 1 year |  |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in financial instruments |  | $ 399,300 |  | 100,700 |  |
Change in fair value of short-term investments |  | 5,300 |  | 4,300 |  |
Impairment loss |  | $ 200 |  | $ 400 |  |
[1] | In the fourth quarter of 2019, the Sohu Group recognized impairment losses of $23.2 million for equity investments.

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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=124260329&loc=SL6284422-111562 + Details
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