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 ($)	Sep. 30, 2020 GBP (£)	Sep. 30, 2020 EUR (€)	Dec. 31, 2019 USD ($)
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