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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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