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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Textual) (Details)
$ in Thousands
12 Months Ended
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%