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DERIVATIVE INSTRUMENTS (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Nov. 28, 2017 USD ($) | Oct. 02, 2017 USD ($) | Oct. 02, 2017 CHF (SFr)
Derivative [Line Items] |  |  |  |  |  |
Gain recorded in other income, net related to change in fair value, foreign currency translation | $ 13,400,000 | $ 2,958,000 | $ 0 |  |  |
Unrealized derivative (loss) gain arising during period | 11,709,000 | (3,425,000) | $ 1,871,000 |  |  |
Foreign Currency Forward Contract | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  |  | $ 8,900,000.0 |  |
Gain (loss) from change in fair value of the contract | (200,000) | 100,000 |  |  |  |
Cross Currency Interest Rate Swap | Codman |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain recorded in other income, net related to change in fair value, foreign currency translation | 2,200,000 | 1,100,000 |  |  |  |
Unrealized derivative (loss) gain arising during period | 9,100,000 | (2,100,000) |  |  |  |
Gain reclassified into income | 7,900,000 | $ 1,900,000 |  |  |  |
Amount estimated to be reclassified to earnings during next twelve months | 7,600,000 |  |  |  |  |
Cross Currency Interest Rate Swap | Short | Codman |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  |  |  |  | $ 300,000,000 |
Cross Currency Interest Rate Swap | Long | Codman |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | SFr |  |  |  |  |  | SFr 291,200,000.0
Cross Currency Interest Rate Swap | Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain recorded in AOCI, change in fair value | 1,700,000 |  |  |  |  |
Cross Currency Interest Rate Swap | Designated as Hedging Instrument | Net Investment Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Gain reclassified into income | 2,400,000 |  |  |  |  |
Amount estimated to be reclassified to earnings during next twelve months | $ 8,900,000 |  |  |  |  |

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