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EMPLOYEE BENEFIT PLANS Fair value plan assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Total investments | 100.00% | 100.00% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 84,753 | $ 79,185 | $ 90,342
Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 235 | 241 |
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 | 43.40% | 37.50% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 36,677 | $ 29,601 |
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 | 18.70% | 6.90% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 15,983 | $ 5,691 |
Other Investments [Member] | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 235 | 241 |
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 | 11.70% | 23.00% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 9,916 | $ 18,189 |
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% | 14.00% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 3,881 | $ 11,055 |
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 | 21.60% | 18.60% |
Defined Benefit Plan, Fair Value of Plan Assets | $ 18,296 | $ 14,649 |
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 | 84,518 | 78,944 |
Estimate of Fair Value Measurement [Member] | Fixed Income Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 36,677 | 29,601 |
Estimate of Fair Value Measurement [Member] | Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 15,748 | 5,450 |
Estimate of Fair Value Measurement [Member] | Canada | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 9,916 | 18,189 |
Estimate of Fair Value Measurement [Member] | United States | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3,881 | 11,055 |
Estimate of Fair Value Measurement [Member] | Non-US [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 18,296 | $ 14,649 |

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