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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.

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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Curtailment -URI http://asc.fasb.org/extlink&oid=6520938 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 + Details
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