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EMPLOYEE BENEFIT PLANS Fair value plan assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Total investments | 100.00% | 100.00% |
Defined Benefit Plan, Plan Assets, Amount | $ 103,385 | $ 86,556 | $ 97,182
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 224 | 203 |
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | $ 0 |
Fixed Income Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Total investments | 44.80% | 44.70% |
Defined Benefit Plan, Plan Assets, Amount | $ 46,309 | $ 38,668 |
Fixed Income Investments [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fixed Income Investments [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Fixed Income Investments [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | $ 0 |
Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Total investments | 15.20% | 15.40% |
Defined Benefit Plan, Plan Assets, Amount | $ 15,704 | $ 13,347 |
Other Investments [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 224 | 203 |
Other Investments [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Other Investments [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | $ 0 |
Canada | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Total investments | 12.50% | 12.40% |
Defined Benefit Plan, Plan Assets, Amount | $ 12,973 | $ 10,693 |
Canada | Equity Securities [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Canada | Equity Securities [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Canada | Equity Securities [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | $ 0 |
United States | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Total investments | 5.00% | 5.00% |
Defined Benefit Plan, Plan Assets, Amount | $ 5,160 | $ 4,356 |
United States | Equity Securities [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
United States | Equity Securities [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
United States | Equity Securities [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 0 | $ 0 |
Non-US [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Total investments | 22.50% | 22.50% |
Defined Benefit Plan, Plan Assets, Amount | $ 23,239 | $ 19,492 |
Non-US [Member] | Equity Securities [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Non-US [Member] | Equity Securities [Member] | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Non-US [Member] | Equity Securities [Member] | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0 | 0 |
Estimate of Fair Value Measurement [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 103,161 | 86,353 |
Estimate of Fair Value Measurement [Member] | Fixed Income Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 46,309 | 38,668 |
Estimate of Fair Value Measurement [Member] | Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 15,480 | 13,144 |
Estimate of Fair Value Measurement [Member] | Canada | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 12,973 | 10,693 |
Estimate of Fair Value Measurement [Member] | United States | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 5,160 | 4,356 |
Estimate of Fair Value Measurement [Member] | Non-US [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 23,239 | $ 19,492 |

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