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EMPLOYEE BENEFIT PLANS Fair value plan assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure
Total investments	100.00%	100.00%
Defined Benefit Plan, Fair Value of Plan Assets	$ 97,182	$ 84,753	$ 79,185
Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	3,996	235
Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0
Fixed Income Investments [Member]
Defined Benefit Plan Disclosure
Total investments	41.40%	43.40%
Defined Benefit Plan, Fair Value of Plan Assets	$ 40,193	$ 36,677
Fixed Income Investments [Member] | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Investments [Member] | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Fixed Income Investments [Member] | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0
Other Investments [Member]
Defined Benefit Plan Disclosure
Total investments	21.70%	18.70%
Defined Benefit Plan, Fair Value of Plan Assets	$ 21,135	$ 15,983
Other Investments [Member] | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	3,996
Other Investments [Member] | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Other Investments [Member] | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0
Canada | Equity Securities [Member]
Defined Benefit Plan Disclosure
Total investments	11.50%	11.70%
Defined Benefit Plan, Fair Value of Plan Assets	$ 11,211	$ 9,916
Canada | Equity Securities [Member] | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Canada | Equity Securities [Member] | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Canada | Equity Securities [Member] | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0
United States | Equity Securities [Member]
Defined Benefit Plan Disclosure
Total investments	4.60%	4.60%
Defined Benefit Plan, Fair Value of Plan Assets	$ 4,436	$ 3,881
United States | Equity Securities [Member] | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
United States | Equity Securities [Member] | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
United States | Equity Securities [Member] | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	$ 0	$ 0
Non-US [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure
Total investments	20.80%	21.60%
Defined Benefit Plan, Fair Value of Plan Assets	$ 20,207	$ 18,296
Non-US [Member] | Equity Securities [Member] | Level 1
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Non-US [Member] | Equity Securities [Member] | Level 2
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Non-US [Member] | Equity Securities [Member] | Level 3
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	0	0
Estimate of Fair Value Measurement [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	93,186	84,518
Estimate of Fair Value Measurement [Member] | Fixed Income Investments [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	40,193	36,677
Estimate of Fair Value Measurement [Member] | Other Investments [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	17,139	15,748
Estimate of Fair Value Measurement [Member] | Canada | Equity Securities [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	11,211	9,916
Estimate of Fair Value Measurement [Member] | United States | Equity Securities [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	4,436	3,881
Estimate of Fair Value Measurement [Member] | Non-US [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure
Defined Benefit Plan, Fair Value of Plan Assets	$ 20,207	$ 18,296

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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