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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 ($)	Dec. 31, 2018 USD ($)
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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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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