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	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 CHF (SFr)	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 CHF (SFr)	Dec. 31, 2019 EUR (€)	Dec. 31, 2019 USD ($)
Cross Currency Interest Rate Swap One
Derivative [Line Items]
Fair Value Asset (Liability)				$ 4,082				$ 2,459
Cross Currency Interest Rate Swap One | Long
Derivative [Line Items]
Fixed Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount | €			€ 44,859				€ 44,859
Cross Currency Interest Rate Swap One | Short
Derivative [Line Items]
Fixed Rate	3.01%	3.01%	3.01%	3.01%	3.01%	3.01%	3.01%	3.01%
Aggregate Notional Amount				$ 52,000				$ 52,000
Cross Currency Interest Rate Swap Two
Derivative [Line Items]
Fair Value Asset (Liability)				$ 6,298				$ 3,087
Cross Currency Interest Rate Swap Two | Long
Derivative [Line Items]
Fixed Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount | €			€ 51,760				€ 51,760
Cross Currency Interest Rate Swap Two | Short
Derivative [Line Items]
Fixed Rate	2.57%	2.57%	2.57%	2.57%	2.57%	2.57%	2.57%	2.57%
Aggregate Notional Amount				$ 60,000				$ 60,000
Cross Currency Interest Rate Swap Three
Derivative [Line Items]
Fair Value Asset (Liability)				$ 5,174				$ 2,032
Cross Currency Interest Rate Swap Three | Long
Derivative [Line Items]
Fixed Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount | €			€ 38,820				€ 38,820
Cross Currency Interest Rate Swap Three | Short
Derivative [Line Items]
Fixed Rate	2.19%	2.19%	2.19%	2.19%	2.19%	2.19%	2.19%	2.19%
Aggregate Notional Amount				$ 45,000				$ 45,000
Cross Currency Interest Rate Swap Four
Derivative [Line Items]
Fair Value Asset (Liability)				$ 16,773				$ (154)
Cross Currency Interest Rate Swap Four | Long
Derivative [Line Items]
Fixed Rate	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%
Aggregate Notional Amount | £	£ 128,284				£ 128,284
Cross Currency Interest Rate Swap Four | Short
Derivative [Line Items]
Fixed Rate	2.71%	2.71%	2.71%	2.71%	2.71%	2.71%	2.71%	2.71%
Aggregate Notional Amount				$ 167,500				$ 167,500
Cross Currency Interest Rate Swap Five
Derivative [Line Items]
Fair Value Asset (Liability)				$ (6,965)				$ 1,221
Cross Currency Interest Rate Swap Five | Long
Derivative [Line Items]
Fixed Rate	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Aggregate Notional Amount | SFr		SFr 165,172				SFr 165,172
Cross Currency Interest Rate Swap Five | Short
Derivative [Line Items]
Fixed Rate	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%	1.67%
Aggregate Notional Amount | £	£ 128,284				£ 128,284
Cross Currency Interest Rate Swap
Derivative [Line Items]
Fair Value Asset (Liability)				$ 25,362				$ 8,645