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PENSION AND OTHER POSTRETIREMENT PLANS (Details 5) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Pension Benefits |  |  |
Employee benefits |  |  |
Total plan assets | $ 34,695 | $ 27,914 | $ 24,562
Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 34,695 | 27,914 |
Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 21,875 | 19,588 |
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 12,820 | 8,326 |
Cash and cash equivalents: | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,821 | 822 |
Cash and cash equivalents: | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Cash and cash equivalents: | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,821 | 822 |
Cash | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Cash | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Cash | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Short term investment funds | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,821 | 822 |
Short term investment funds | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Short term investment funds | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,821 | 822 |
Equity Securities | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 20,368 | 17,882 |
Equity Securities | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 20,368 | 17,882 |
Equity Securities | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
U.S. Large cap | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 9,587 | 8,950 |
U.S. Large cap | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 9,587 | 8,950 |
U.S. Large cap | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
U.S. Mid cap/small cap | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 3,131 | 3,038 |
U.S. Mid cap/small cap | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 3,131 | 3,038 |
U.S. Mid cap/small cap | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
International | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 7,283 | 5,770 |
International | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 7,283 | 5,770 |
International | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Equity blend | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 367 | 124 |
Equity blend | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 367 | 124 |
Equity blend | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Fixed income securities | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 11,506 | 9,210 |
Fixed income securities | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,507 | 1,706 |
Fixed income securities | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 9,999 | 7,504 |
Government issues | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,634 | 1,948 |
Government issues | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,507 | 1,706 |
Government issues | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 127 | 242 |
Corporate bonds | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,837 | 1,795 |
Corporate bonds | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Corporate bonds | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,837 | 1,795 |
Mortgage backed | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,007 | 960 |
Mortgage backed | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Mortgage backed | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,007 | 960 |
High yield bonds and bond funds | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 6,028 | 4,507 |
High yield bonds and bond funds | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
High yield bonds and bond funds | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | $ 6,028 | $ 4,507 |

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