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EMPLOYEE BENEFIT PLANS Fair value plan assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Total investments | 100.00% | 100.00% |
Defined Benefit Plan, Plan Assets, Amount | $ 86,556 | $ 97,182 | $ 84,753
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 203 | 3,996 |
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 | 44.70% | 41.40% |
Defined Benefit Plan, Plan Assets, Amount | $ 38,668 | $ 40,193 |
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 | 15.40% | 21.70% |
Defined Benefit Plan, Plan Assets, Amount | $ 13,347 | $ 21,135 |
Other Investments [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 203 | 3,996 |
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 | 12.40% | 11.50% |
Defined Benefit Plan, Plan Assets, Amount | $ 10,693 | $ 11,211 |
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% | 4.60% |
Defined Benefit Plan, Plan Assets, Amount | $ 4,356 | $ 4,436 |
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% | 20.80% |
Defined Benefit Plan, Plan Assets, Amount | $ 19,492 | $ 20,207 |
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 | 86,353 | 93,186 |
Estimate of Fair Value Measurement [Member] | Fixed Income Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 38,668 | 40,193 |
Estimate of Fair Value Measurement [Member] | Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 13,144 | 17,139 |
Estimate of Fair Value Measurement [Member] | Canada | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 10,693 | 11,211 |
Estimate of Fair Value Measurement [Member] | United States | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | 4,356 | 4,436 |
Estimate of Fair Value Measurement [Member] | Non-US [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 19,492 | $ 20,207 |

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