FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Hedge Accounting Activities (Details) $ in Thousands	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivative [Line Items]
Fair Value as at March 31, 2019	$ (12,557)	$ (9,817)
2023 Euro Loan [Member] \| Interest Rate Swap, Apr 26, 2018, 468.8m EUR [Member]
Derivative [Line Items]
Number of Contracts	4
Aggregate Notional Amount	$ 468,800
Fair Value as at March 31, 2019	$ (8,691)
2023 Euro Loan [Member] \| Interest Rate Swap, Apr 5, 2016, 468.8m EUR [Member]
Derivative [Line Items]
Number of Contracts	5
Aggregate Notional Amount	$ 468,800
Fair Value as at March 31, 2019	$ (2,497)
2021 Euro Loan [Member] \| Interest Rate Swap, Apr 26, 2018, 210.335m EUR [Member]
Derivative [Line Items]
Number of Contracts	3
Aggregate Notional Amount	$ 150,335
Fair Value as at March 31, 2019	$ (1,368)
2021 Euro Loan [Member] \| Interest Rate Swap, Nov 10, 2015, 210.335m EUR [Member]
Derivative [Line Items]
Number of Contracts	3
Aggregate Notional Amount	$ 150,335
Fair Value as at March 31, 2019	$ (317)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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

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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=109250915&loc=d3e13433-108611

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
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-Topic 815
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-Section 50
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