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FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Fair value of option investments, beginning balance | $ 1,405 | $ 73,902 | $ 82,966
Total gains (losses) included in earnings | (1,405) | (72,497) | (9,064)
Fair value of option investments, ending balance | 0 | 1,405 | 73,902
Unrealized gain (losses) still held | (1,405) | (72,497) | (9,064)
Contingent consideration, beginning balance | 1,298 | 1,529 | 0
Issuance of contingent consideration in connection with acquisitions | 0 | 0 | 1,589
Settlements of contingent consideration liabilities | (908) | (312) | 0
Total losses (gains) included in earnings | 6 | 39 | 56
Foreign currency translation | (70) | 42 | (116)
Contingent consideration, ending balance | 326 | 1,298 | 1,529
Unrealized (losses) gains still held | 6 | 39 | 56
Convertible Debt Securities |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Unrealized gain (losses) still held | 0 | 0 | 0
Convertible debt securities, beginning balance | 0 | 0 | 11,354
Proceeds from sales and maturities of convertible debt securities | 0 | 0 | (8,594)
Transfer to other equity method investment upon conversion of convertible debt security | 0 | 0 | (4,008)
Total gains (losses) included in other comprehensive income (loss) | 0 | 0 | (1,148)
Gains (losses) included in earnings | 0 | 0 | 2,396
Convertible debt securities, ending balance | 0 | 0 | 0
Redeemable Preferred Stock |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Unrealized gain (losses) still held | 0 | (10,340) | (5,091)
Total gains (losses) included in other comprehensive income (loss) | 0 | (379) | 379
Redeemable preferred shares, beginning balance | 0 | 10,340 | 15,431
Impairments included in earnings | 0 | (9,961) | (5,470)
Redeemable preferred shares, ending balance | $ 0 | $ 0 | $ 10,340

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- Definition Fair Value, Measurement with unobservable input reconciliation, recurring basis, asset, available-for-sale investment transfer to other equity investment + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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