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Fair Value Measurements (Financial Instruments, Measured at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | $ 949,884 | $ 173,655
Restricted cash | 1,969 | 330,791
Restricted time deposits | 0 | 101,519
Short-term investments | 399,345 | 100,745
Equity investments with readily determinable fair values | 14,642 | 9,457
Long-term time deposits | 189,007 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Restricted cash | 0 | 0
Restricted time deposits |  | 0
Short-term investments | 0 | 0
Equity investments with readily determinable fair values | 14,642 | 9,457
Long-term time deposits | 0 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 949,884 | 173,655
Restricted cash | 1,969 | 330,791
Restricted time deposits |  | 101,519
Short-term investments | 399,345 | 100,745
Equity investments with readily determinable fair values | 0 | 0
Long-term time deposits | 189,007 |
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Restricted cash | 0 | 0
Restricted time deposits |  | 0
Short-term investments | 0 | 0
Equity investments with readily determinable fair values | 0 | $ 0
Long-term time deposits | $ 0 |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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