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, 2019 GBP (£)	Mar. 31, 2019 CHF (SFr)	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Cross Currency Interest Rate Swap One
Derivative [Line Items]
Fair Value Asset (Liability)				$ 3,343	$ 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)				$ 2,175	(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)				$ 1,037	(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)				$ (1,026)	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)				$ 1,731	(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)				$ 7,260	$ (632)