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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, 2019 GBP (£) | Sep. 30, 2019 CHF (SFr) | Sep. 30, 2019 EUR (€) | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Cross Currency Interest Rate Swap One |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  |  |  | $ 6,141 | $ 1,359
Cross Currency Interest Rate Swap One | Long |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 0.00% | 0.00% | 0.00% | 0.00% |
Aggregate Notional Amount | € |  |  | € 70,738 |  |
Cross Currency Interest Rate Swap One | Short |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fixed Rate | 3.01% | 3.01% | 3.01% | 3.01% |
Aggregate Notional Amount |  |  |  | $ 82,000 |
Cross Currency Interest Rate Swap Two |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Fair Value Asset (Liability) |  |  |  | $ 4,532 | (421)
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) |  |  |  | $ 2,911 | (150)
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) |  |  |  | $ 11,678 | 2,360
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) |  |  |  | $ (6,561) | (3,780)
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) |  |  |  | $ 18,701 | $ (632)

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