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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Textual) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
hours
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
After-tax amounts included in Accumulated other comprehensive loss          
Unrecognized actuarial net loss $ 85,253   $ 85,253    
Unrecognized prior service credits (8)   (8)    
Unrecognized transition obligations 32   32    
Pre-tax amounts expected to be recognized as components of net periodic benefit cost during next fiscal year          
Unrecognized actuarial net loss     3,793    
Unrecognized prior service credits     1    
Unrecognized transition obligations     3    
Total accumulated benefit obligation for all plans 691,827   691,827 $ 560,230  
Supplemental Executive Retirement Plan          
Total net pension costs [1]     $ 2,517 13,988 $ 162,815
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, Recognized Net Gain (Loss) Due to Settlements and Curtailments (2,867) $ (5,283) $ (8,252) [2] 1,062 [2] (142,738) [2]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments     (2,206)    
Supplemental executive retirement plan (SERP)          
Supplemental Executive Retirement Plan          
Total net pension costs     772 2,113 1,703
Projected benefit obligation $ 17,047   17,047 $ 16,738 $ 14,643
Other Benefits          
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments     $ (1,144)    
Equity Securities          
Target allocation for pension plan assets          
Target plan asset allocations range minimum     15.00%    
Target plan asset allocations range maximum     25.00%    
Debt Securities          
Target allocation for pension plan assets          
Target plan asset allocations range minimum     75.00%    
Target plan asset allocations range maximum     85.00%    
[1] The decrease in pension cost for defined benefit plans for the year ended December 31, 2017 was due to the U.S. plan freeze effective December 31, 2016.
[2] Pension settlement charges for the year ended December 31, 2017 resulting from lump sum pension payments. For the year ended December 31, 2015, the Company recorded pension settlement charges of $142,738, primarily related to the purchase of the group annuity contract.