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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%