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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Textual) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) hours | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
After-tax amounts included in Accumulated other comprehensive loss |  |  |  |  |  |
Unrecognized actuarial net loss |  |  |  | $ 70,205 |  |
Unrecognized prior service credits |  |  |  | 320 |  |
Unrecognized transition obligations |  |  |  | 21 |  |
Pre-tax amounts expected to be recognized as components of net periodic benefit cost during next fiscal year |  |  |  |  |  |
Unrecognized actuarial net loss |  |  |  | 3,105 |  |
Unrecognized prior service credits |  |  |  | 60 |  |
Unrecognized transition obligations |  |  |  | 3 |  |
Total accumulated benefit obligation for all plans | $ 600,998 |  |  | $ 663,163 | $ 600,998 |
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) | hours |  |  |  | 40 |  |
Minimum notice period for the termination of Guaranteed Continuous Employment Plan (in months) |  |  |  | 6 months |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment | (1,696) | $ (4,232) | $ (758) |  |  |
Supplemental executive retirement plan (SERP) |  |  |  |  |  |
Supplemental Executive Retirement Plan |  |  |  |  |  |
Total net pension costs |  |  |  | $ 576 | 1,268 | $ 772
Projected benefit obligation | $ 12,183 |  |  | $ 12,202 | $ 12,183 | $ 17,047
Equity Securities | Minimum |  |  |  |  |  |
Target allocation for pension plan assets |  |  |  |  |  |
Target plan asset allocations range minimum |  |  |  | 5.00% |  |
Equity Securities | Maximum |  |  |  |  |  |
Target allocation for pension plan assets |  |  |  |  |  |
Target plan asset allocations range minimum |  |  |  | 15.00% |  |
Debt Securities | Minimum |  |  |  |  |  |
Target allocation for pension plan assets |  |  |  |  |  |
Target plan asset allocations range minimum |  |  |  | 85.00% |  |
Debt Securities | Maximum |  |  |  |  |  |
Target allocation for pension plan assets |  |  |  |  |  |
Target plan asset allocations range minimum |  |  |  | 95.00% |  |

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