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PENSION AND OTHER POSTRETIREMENT PLANS - Financial Assets Measured At Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension Benefits |  |  |
Employee benefits |  |  |
Total plan assets | $ 39,745 | $ 33,874 | $ 34,695
Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 39,745 | 33,874 |
Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 25,050 | 20,909 |
Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 14,695 | 12,965 |
Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Cash Equivalents | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,444 | 1,063 |
Cash Equivalents | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Cash Equivalents | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,444 | 1,063 |
Cash Equivalents | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
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 |
Cash | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Short term investment funds | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,444 | 1,063 |
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 | 1,444 | 1,063 |
Short term investment funds | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Equity Securities | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 23,026 | 18,568 |
Equity Securities | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 23,026 | 18,568 |
Equity Securities | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Equity Securities | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
U.S. Large cap | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 12,097 | 9,173 |
U.S. Large cap | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 12,097 | 9,173 |
U.S. Large cap | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
U.S. Large cap | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
U.S. Mid cap/small cap | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 4,195 | 2,760 |
U.S. Mid cap/small cap | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 4,195 | 2,760 |
U.S. Mid cap/small cap | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
U.S. Mid cap/small cap | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
International | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 6,320 | 6,480 |
International | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 6,320 | 6,480 |
International | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
International | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Equities blend | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 414 | 155 |
Equities blend | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 414 | 155 |
Equities blend | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Equities blend | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Fixed income securities | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 15,275 | 14,243 |
Fixed income securities | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,024 | 2,341 |
Fixed income securities | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 13,251 | 11,902 |
Fixed income securities | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Government issues | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,024 | 2,341 |
Government issues | Quoted Prices In Active Markets for Identical Assets (Level 1) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,024 | 2,341 |
Government issues | Significant Other Observable Inputs (Level 2) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Government issues | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Corporate bonds | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 2,926 | 2,098 |
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 | 2,926 | 2,098 |
Corporate bonds | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
Mortgage backed | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 1,033 | 1,132 |
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 | 1,033 | 1,132 |
Mortgage backed | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 0 | 0 |
High yield bonds and bond funds | Carrying Amount | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | 9,292 | 8,672 |
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 | 9,292 | 8,672 |
High yield bonds and bond funds | Significant Unobservable Inputs (Level 3) | Recurring basis |  |  |
Employee benefits |  |  |
Total plan assets | $ 0 | $ 0 |

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