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DERIVATIVE INSTRUMENTS - Schedule of Cross Currency Swap Derivatives (Details) | Sep. 30, 2021 USD ($) | Sep. 30, 2021 CHF (SFr) | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CHF (SFr) | Dec. 21, 2020 USD ($) | Dec. 21, 2020 CHF (SFr) | Oct. 02, 2017 USD ($) | Oct. 02, 2017 CHF (SFr)
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Cross-currency swap |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Aggregate Notional Amount |  |  | $ 7,300,000 |  |  | $ 471,600,000 | SFr 420,100,000 |  |
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 |
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair Value Asset (Liability) | $ (54,814,000) |  |  | $ (93,769,000) |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Cross Currency Interest Rate Swap Three | Long |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fixed Rate | 3.00% | 3.00% |  |  |  |  |  |  |
Aggregate Notional Amount | SFr |  | SFr 402,887,000 |  |  | SFr 420,137,000 |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Cross Currency Interest Rate Swap Three | Short |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fixed Rate | 3.98% | 3.98% |  |  |  |  |  |  |
Aggregate Notional Amount | $ 452,275,000 |  |  | 471,640,000 |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair Value Asset (Liability) | 8,759,000 |  |  | (23,440,000) |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross Currency Interest Rate Swap One |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair Value Asset (Liability) | $ (1,727,000) |  |  | (4,335,000) |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross Currency Interest Rate Swap One | Long |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fixed Rate | 1.85% | 1.85% |  |  |  |  |  |  |
Aggregate Notional Amount | SFr |  | SFr 48,533,000 |  |  |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross Currency Interest Rate Swap One | Short |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fixed Rate | 4.46% | 4.46% |  |  |  |  |  |  |
Aggregate Notional Amount | $ 50,000,000 |  |  |  |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross Currency Interest Rate Swap Two |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair Value Asset (Liability) | $ (3,894,000) |  |  | (11,262,000) |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross Currency Interest Rate Swap Two | Long |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fixed Rate | 1.95% | 1.95% |  |  |  |  |  |  |
Aggregate Notional Amount | SFr |  | SFr 145,598,000 |  |  |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross Currency Interest Rate Swap Two | Short |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fixed Rate | 4.52% | 4.52% |  |  |  |  |  |  |
Aggregate Notional Amount | $ 150,000,000 |  |  |  |  |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Codman | Cross Currency Interest Rate Swap Three |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |
Fair Value Asset (Liability) | $ 14,380,000 |  |  | $ (7,843,000) |  |  |  |  |

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