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DERIVATIVE INSTRUMENTS - Schedule of Cross Currency Swap Derivatives (Details) | Jun. 30, 2019 CHF (SFr) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 CHF (SFr) | Dec. 31, 2018 USD ($) | Oct. 02, 2017 CHF (SFr) | Oct. 02, 2017 USD ($)
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Codman | Cross-currency swap | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Aggregate Notional Amount | SFr |  |  |  |  | SFr 291,200,000 |
Codman | Cross-currency swap | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Aggregate Notional Amount |  |  |  |  |  | $ 300,000,000.0
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Aggregate Notional Amount |  | $ 1,475,000,000 |  |  |  |
Fair Value Asset (Liability) |  | (43,161,000) |  | $ 619,000 |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross-currency swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Aggregate Notional Amount |  | 33,300,000 |  |  |  |
Fair Value Asset (Liability) |  | (747,000) |  | (2,830,000) |  |
Cash Flow Hedges | Swap One | Designated as Hedging Instrument | Codman | Cross-currency swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair Value Asset (Liability) |  | $ 20,000 |  | $ (215,000) |  |
Cash Flow Hedges | Swap One | Designated as Hedging Instrument | Codman | Cross-currency swap | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed Rate | 1.75% | 1.75% | 1.75% | 1.75% |  |
Aggregate Notional Amount | SFr | SFr 64,710,000 |  | SFr 97,065,000 |  |  |
Cash Flow Hedges | Swap One | Designated as Hedging Instrument | Codman | Cross-currency swap | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed Rate | 4.38% | 4.38% | 4.38% | 4.38% |  |
Aggregate Notional Amount |  | $ 66,667,000 |  | $ 100,000,000 |  |
Cash Flow Hedges | Swap Two | Designated as Hedging Instrument | Codman | Cross-currency swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair Value Asset (Liability) |  | $ (77,000) |  | $ (422,000) |  |
Cash Flow Hedges | Swap Two | Designated as Hedging Instrument | Codman | Cross-currency swap | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed Rate | 1.85% | 1.85% | 1.85% | 1.85% |  |
Aggregate Notional Amount | SFr | SFr 48,533,000 |  | SFr 48,533,000 |  |  |
Cash Flow Hedges | Swap Two | Designated as Hedging Instrument | Codman | Cross-currency swap | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed Rate | 4.46% | 4.46% | 4.46% | 4.46% |  |
Aggregate Notional Amount |  | $ 50,000,000 |  | $ 50,000,000 |  |
Cash Flow Hedges | Swap Three | Designated as Hedging Instrument | Codman | Cross-currency swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair Value Asset (Liability) |  | $ (690,000) |  | $ (2,193,000) |  |
Cash Flow Hedges | Swap Three | Designated as Hedging Instrument | Codman | Cross-currency swap | Long |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed Rate | 1.95% | 1.95% | 1.95% | 1.95% |  |
Aggregate Notional Amount | SFr | SFr 145,598,000 |  | SFr 145,598,000 |  |  |
Cash Flow Hedges | Swap Three | Designated as Hedging Instrument | Codman | Cross-currency swap | Short |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fixed Rate | 4.52% | 4.52% | 4.52% | 4.52% |  |
Aggregate Notional Amount |  | $ 150,000,000 |  | $ 150,000,000 |  |

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