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FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract] |  |  |
Investments carried at fair value |  | $ 21,992 | $ 0
Recurring [Member] |  |  |
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract] |  |  |
Cash equivalents |  | 575,601 | 74,272
Held to maturity investments |  | 787,608 | 100,357
Available-for-sale investments |  | 213,476 | 27,045
Equity securities |  | 55,533 | 76,000
Investments carried at fair value |  | 21,992 |
Other assets |  | 16,221 | 19,024
Derivative assets | [1] | 67 |
Derivative liabilities | [2] | (1,204) |
Share appreciation rights |  | (18,038) | (11,640)
Total liabilities, net, at fair value |  | 1,651,256 | 285,058
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract] |  |  |
Cash equivalents |  | 575,601 | 74,272
Held to maturity investments |  | 787,122 | 100,071
Available-for-sale investments |  | 49,017 | 5,688
Equity securities |  | 55,533 | 76,000
Investments carried at fair value |  | 0 |
Other assets |  | 0 | 0
Derivative assets | [1] | 0 |
Derivative liabilities | [2] | 0 |
Share appreciation rights |  | (18,038) | (11,640)
Total liabilities, net, at fair value |  | 1,449,235 | 244,391
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract] |  |  |
Cash equivalents |  | 0 | 0
Held to maturity investments |  | 0 | 0
Available-for-sale investments |  | 0 | 0
Equity securities |  | 0 | 0
Investments carried at fair value |  | 0 |
Other assets |  | 0 | 0
Derivative assets | [1] | 67 |
Derivative liabilities | [2] | (1,204) |
Share appreciation rights |  | 0 | 0
Total liabilities, net, at fair value |  | (1,137) | 0
Recurring [Member] | Unobservable Inputs (Level 3) [Member] |  |  |
Fair Values of Assets and Liabilities Measured on a Recurring Basis [Abstract] |  |  |
Cash equivalents |  | 0 | 0
Held to maturity investments |  | 486 | 286
Available-for-sale investments |  | 164,459 | 21,357
Equity securities |  | 0 | 0
Investments carried at fair value |  | 21,992 |
Other assets |  | 16,221 | 19,024
Derivative assets | [1] | 0 |
Derivative liabilities | [2] | 0 |
Share appreciation rights |  | 0 | 0
Total liabilities, net, at fair value |  | $ 203,158 | $ 40,667
[1] | Included in prepaid expenses and other assets in the consolidated balance sheets and not designated as hedges.
[2] | Included in accrued expenses and other payables in the consolidated balance sheets and not designated as hedges.

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