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FAIR VALUE MEASUREMENTS - Fair Value, Assets and Liabilities, Reconciliation of Level 3 Inputs (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Contingent Consideration [Roll Forward] |  |  |  |
Contingent consideration, beginning balance | $ 278 | $ 1,239 | $ 1,298 | $ 1,529
Settlements of contingent consideration liabilities | 0 | 0 | (908) | (312)
Total losses (gains) included in earnings | 0 | 6 | 6 | 33
Foreign currency translation | 13 | (38) | (105) | (43)
Contingent consideration, ending balance | 291 | 1,207 | 291 | 1,207
Unrealized gains (losses) still held | 0 | 6 | 6 | 33
Fair Value Option Investments |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |
Fair value option investments, beginning balance | 0 | 4,917 | 1,405 | 73,902
Total gains (losses) included in earnings | 0 | 14 | (1,405) | (68,971)
Fair value option investments, ending balance | 0 | 4,931 | 0 | 4,931
Unrealized gains (losses) still held | 0 | 14 | (1,405) | (68,971)
Redeemable Preferred Stock |  |  |  |
Equity Method Investments [Roll Forward] |  |  |  |
Unrealized gains (losses) still held | 0 | (63) | 0 | (202)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value [Roll Forward] |  |  |  |
Available-for-sale securities, redeemable preferred shares, beginning balance | 0 | 10,201 | 0 | 10,340
Total gains (losses) included in other comprehensive income (loss) | 0 | (63) | 0 | (202)
Available-for-sale securities, redeemable preferred shares, ending balance | $ 0 | $ 10,138 | $ 0 | $ 10,138

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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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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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