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RETIREMENT PLANS - Net Assets and Allocations (Details) - Pension Plans - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Pension plan assets |  |  |
Fair value of plan assets | $ 89,352 | $ 83,350 | $ 77,530
Weighted-average asset allocations (as a percent) | 100.00% | 100.00% |
Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 49,123 | $ 53,533 |
Level 2 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | 40,229 | 29,380 |
Level 3 |  |  |
Pension plan assets |  |  |
Fair value of plan assets |  | 437 |
Cash, cash equivalents, money markets and other |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 5,037 | $ 4,982 |
Weighted-average asset allocations (as a percent) | 6.00% | 6.00% |
Cash, cash equivalents, money markets and other | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 5,037 | $ 4,982 |
Common Stock |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 27,785 | $ 26,702 |
Weighted-average asset allocations (as a percent) | 31.00% | 32.00% |
Common Stock | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 24,781 | $ 22,451 |
Common Stock | Level 2 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | 3,004 | 4,251 |
Mutual funds - fixed income |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 9,494 | $ 12,970 |
Weighted-average asset allocations (as a percent) | 11.00% | 16.00% |
Mutual funds - fixed income | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 9,494 | $ 12,970 |
Mutual funds - equities |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 8,278 | $ 10,921 |
Weighted-average asset allocations (as a percent) | 9.00% | 13.00% |
Mutual funds - equities | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 8,278 | $ 10,921 |
Fixed income securities |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 37,225 | $ 26,307 |
Weighted-average asset allocations (as a percent) | 41.00% | 32.00% |
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 | $ 37,225 | 25,129 |
Other |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 1,533 | $ 1,468 |
Weighted-average asset allocations (as a percent) | 2.00% | 1.00% |
Other | Level 1 |  |  |
Pension plan assets |  |  |
Fair value of plan assets | $ 1,533 | $ 1,031 |
Other | Level 3 |  |  |
Pension plan assets |  |  |
Fair value of plan assets |  | $ 437 |

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