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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Textual) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
After-tax amounts included in Accumulated other comprehensive loss |  |  |
Unrecognized actuarial net loss | $ 101,478 |  |
Unrecognized prior service credits | 273 |  |
Unrecognized transition obligations | 19 |  |
Total accumulated benefit obligation for all plans | $ 742,284 | $ 663,163 |
Other Benefits |  |  |
Minimum percentage of every standard work week for which, the Company will provide work to employees in Cleveland, Ohio, area operations, covered under the guaranteed continuous employment plan (as a percent) | 75.00% |  |
Hours in a standard work week under Guaranteed Continuous Employment Plan (hours) | item | 40 |  |
Minimum notice period for the termination of Guaranteed Continuous Employment Plan (in months) | 6 months |  |
Unrecognized actuarial losses, currently recorded in AOCI | $ 106,377 |  |
Supplemental executive retirement plan (SERP) |  |  |
Supplemental Executive Retirement Plan |  |  |
Total net pension costs | 1,225 | 576 | $ 1,268
Projected benefit obligation | $ 8,194 | $ 12,202 | $ 12,183
Corporate stock | Minimum |  |  |
Target allocation for pension plan assets |  |  |
Target plan asset allocations range minimum | 10.00% |  |
Corporate stock | Maximum |  |  |
Target allocation for pension plan assets |  |  |
Target plan asset allocations range minimum | 20.00% |  |
Debt Securities | Minimum |  |  |
Target allocation for pension plan assets |  |  |
Target plan asset allocations range minimum | 80.00% |  |
Debt Securities | Maximum |  |  |
Target allocation for pension plan assets |  |  |
Target plan asset allocations range minimum | 90.00% |  |

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