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FAIR VALUE MEASUREMENTS (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Oct. 31, 2018 | Jun. 11, 2018 | Sep. 19, 2017 | Jun. 14, 2017 | May 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Annual interest rate on convertible senior notes |  |  |  |  |  |  |  |  | 0.625%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |  |
Beginning balance | $ 49,429,000 | $ 33,108,000 | $ 38,837,000 | $ 57,349,000 |  |  |  |  |
Change in fair value of contingent consideration | 2,790,000 | (167,000) | 17,382,000 | (908,000) |  |  |  |  |
Contingent consideration additions | 0 | 5,800,000 | 0 | 5,800,000 |  |  |  |  |
Contingent consideration payments | (2,000,000) | (23,500,000) | (6,000,000) | (47,000,000) |  |  |  |  |
Ending balance | $ 50,219,000 | $ 15,241,000 | $ 50,219,000 | $ 15,241,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 0 | $ 4,400,000 | $ 0 | $ 0 |
Maximum |  |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  |  | $ 70,200,000 | $ 8,800,000 | $ 6,000,000.0 | $ 1,000,000.0 |

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