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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs | The following table provides a roll-forward of the fair value of recurring Level 3 fair value measurements for the years ended December 31, 2020, 2019 and 2018 (in thousands):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Assets |  |  |  |  |
Fair value option investments: |  |  |  |  |
Beginning Balance | $ | 1,405 |  |  | $ | 73,902 |  |  | $ | 82,966 |
Total gains (losses) included in earnings | (1,405) |  |  | (72,497) |  |  | (9,064) |
Ending Balance | $ | — |  |  | $ | 1,405 |  |  | $ | 73,902 |
Unrealized (losses) gains still held (1) | $ | (1,405) |  |  | $ | (72,497) |  |  | $ | (9,064) |
Available-for-sale securities |  |  |  |  |
Convertible debt securities: |  |  |  |  |
Beginning Balance | $ | — |  |  | $ | — |  |  | $ | 11,354 |
Proceeds from sales and maturities of convertible debt securities | — |  |  | — |  |  | (8,594) |
Transfer to other equity method investment upon conversion of convertible debt security | — |  |  | — |  |  | (4,008) |
Total gains (losses) included in other comprehensive income (loss) | — |  |  | — |  |  | (1,148) |
Total gains (losses) included in earnings (2) | — |  |  | — |  |  | 2,396 |
Ending Balance | $ | — |  |  | $ | — |  |  | $ | — |
Unrealized gains (losses) still held (1) | $ | — |  |  | $ | — |  |  | $ | — |
Redeemable preferred shares: |  |  |  |  |
Beginning Balance | $ | — |  |  | $ | 10,340 |  |  | $ | 15,431 |
Total gains (losses) included in other comprehensive income (loss) | — |  |  | (379) |  |  | 379 |
Impairments included in earnings | — |  |  | (9,961) |  |  | (5,470) |
Ending Balance | $ | — |  |  | $ | — |  |  | $ | 10,340 |
Unrealized gains (losses) still held (1) | $ | — |  |  | $ | (10,340) |  |  | $ | (5,091) |
Liabilities |  |  |  |  |
Contingent Consideration: |  |  |  |  |
Beginning Balance | $ | 1,298 |  |  | $ | 1,529 |  |  | $ | — |
Issuance of contingent consideration in connection with acquisitions | — |  |  | — |  |  | 1,589 |
Settlements of contingent consideration liabilities | (908) |  |  | (312) |  |  | — |
Total losses (gains) included in earnings | 6 |  |  | 39 |  |  | 56 |
Foreign currency translation | (70) |  |  | 42 |  |  | (116) |
Ending Balance | $ | 326 |  |  | $ | 1,298 |  |  | $ | 1,529 |
Unrealized losses (gains) still held (1) | $ | 6 |  |  | $ | 39 |  |  | $ | 56 |
(1)Represents the unrealized gains or losses recorded in earnings and/or other comprehensive income (loss) during the period for assets and liabilities classified as Level 3 that are still held (or outstanding) at the end of the period. (2)Represents a gain at maturity of a previously impaired convertible debt security, accretion of interest income and changes in the fair value of the embedded derivative.

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