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DERIVATIVE INSTRUMENTS - Schedule of Net Investment Hedges Derivatives (Details) - Designated as Hedging Instrument - Net Investment Hedges € in Thousands, £ in Thousands, SFr in Thousands, $ in Thousands | Sep. 30, 2020 CHF (SFr) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 GBP (£) | Sep. 30, 2020 EUR (€) | Dec. 31, 2019 USD ($)
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Cross Currency Interest Rate Swap One |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  | $ 589 |  |  | $ 2,459
Cross Currency Interest Rate Swap One | Long |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 0.00% | 0.00% | 0.00% | 0.00% |
Aggregate Notional Amount | € |  |  |  | € 44,859 |
Cross Currency Interest Rate Swap One | Short |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 3.01% | 3.01% | 3.01% | 3.01% |
Aggregate Notional Amount |  | $ 52,000 |  |  |
Cross Currency Interest Rate Swap Two |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  | $ 2,443 |  |  | 3,087
Cross Currency Interest Rate Swap Two | Long |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 0.00% | 0.00% | 0.00% | 0.00% |
Aggregate Notional Amount | € |  |  |  | € 51,760 |
Cross Currency Interest Rate Swap Two | Short |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 2.57% | 2.57% | 2.57% | 2.57% |
Aggregate Notional Amount |  | $ 60,000 |  |  |
Cross Currency Interest Rate Swap Three |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  | $ 2,398 |  |  | 2,032
Cross Currency Interest Rate Swap Three | Long |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 0.00% | 0.00% | 0.00% | 0.00% |
Aggregate Notional Amount | € |  |  |  | € 38,820 |
Cross Currency Interest Rate Swap Three | Short |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 2.19% | 2.19% | 2.19% | 2.19% |
Aggregate Notional Amount |  | $ 45,000 |  |  |
Cross Currency Interest Rate Swap Four |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  | $ 8,580 |  |  | (154)
Cross Currency Interest Rate Swap Four | Long |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 1.67% | 1.67% | 1.67% | 1.67% |
Aggregate Notional Amount | £ |  |  | £ 128,284 |  |
Cross Currency Interest Rate Swap Four | Short |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 2.71% | 2.71% | 2.71% | 2.71% |
Aggregate Notional Amount |  | $ 167,500 |  |  |
Cross Currency Interest Rate Swap Five |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  | $ (6,828) |  |  | 1,221
Cross Currency Interest Rate Swap Five | Long |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 0.00% | 0.00% | 0.00% | 0.00% |
Aggregate Notional Amount | SFr | SFr 165,172 |  |  |  |
Cross Currency Interest Rate Swap Five | Short |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 1.67% | 1.67% | 1.67% | 1.67% |
Aggregate Notional Amount | £ |  |  | £ 128,284 |  |
Cross Currency Interest Rate Swap |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  | $ 7,182 |  |  | $ 8,645

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