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RETIREMENT PLANS - Net Assets and Allocations (Details) - Pension Plans - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Pension plan assets |  |  |
Fair value of plan assets | $ 83,350 | $ 77,530 | $ 80,892
Weighted-average asset allocations (as a percent) | 100.00% | 100.00% |
Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 53,533 | $ 29,858 |
Level 2 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | 29,380 | 47,182 |
Level 3 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | 437 | 490 |
Cash, cash equivalents, money markets and other |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 4,982 | $ 5,173 |
Weighted-average asset allocations (as a percent) | 6.00% | 7.00% |
Cash, cash equivalents, money markets and other | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 4,982 | $ 5,173 |
Common Stock |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 26,702 | $ 23,052 |
Weighted-average asset allocations (as a percent) | 32.00% | 30.00% |
Common Stock | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 22,451 | $ 18,760 |
Common Stock | Level 2 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | 4,251 | 4,292 |
Mutual funds - fixed income |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 12,970 | $ 16,444 |
Weighted-average asset allocations (as a percent) | 16.00% | 21.00% |
Mutual funds - fixed income | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 12,970 |  |
Mutual funds - fixed income | Level 2 |  |  |
Pension plan assets |  |  |
Fair value of plan assets |  | $ 16,444 |
Mutual funds - equities |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 10,921 | $ 13,099 |
Weighted-average asset allocations (as a percent) | 13.00% | 17.00% |
Mutual funds - equities | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 10,921 | $ 4,748 |
Mutual funds - equities | Level 2 |  |  |
Pension plan assets |  |  |
Fair value of plan assets |  | 8,351 |
Fixed income securities |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 26,307 | $ 18,095 |
Weighted-average asset allocations (as a percent) | 32.00% | 23.00% |
Fixed income securities | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 1,178 |  |
Fixed income securities | Level 2 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | 25,129 | $ 18,095 |
Other |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 1,468 | $ 1,667 |
Weighted-average asset allocations (as a percent) | 1.00% | 2.00% |
Other | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 1,031 | $ 1,177 |
Other | Level 3 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 437 | $ 490 |

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