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FINANCIAL INSTRUMENTS - Changes in Level 3 Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Contingent Consideration Arrangements |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation |  |  |  |
Balance at beginning of period | $ 29,803 | $ (1,910) | $ 28,631 | $ (2,647)
Fair value adjustments | 16,139 | (55) | 12,993 | (265)
Included in other comprehensive loss | 0 | (15) | (14) | (16)
Fair value date of acquisition | 0 | 0 | 0 | 0
Settlements |  |  | 1,988 | 948
Balance at end of period | 13,664 | $ (1,980) | 13,664 | $ (1,980)
Warrant |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation |  |  |  |
Balance at beginning of period | 0 |  | 0 |
Fair value adjustments | (8,689) |  | (8,689) |
Included in other comprehensive loss | 0 |  | 0 |
Fair value date of acquisition | 17,618 |  | 17,618 |
Settlements |  |  | 0 |
Balance at end of period | $ 8,929 |  | $ 8,929 |

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- Definition Amount of gain (loss) recognized in income from liability 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)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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