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EMPLOYEE BENEFIT PLANS (Future benefit payments) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2018
Nonunion Defined Benefit Pension Plan
Estimated future benefit payments
2019		$ 33,373
Employer contributions	$ 5,500	5,500
Adjusted funding target attainment percentage				109.30%
Supplemental Benefit Plan
Estimated future benefit payments
2019		938
2020		2,169
2024-2028		1,142
Employer contributions			$ 989
Postretirement Health Benefit Plan
Estimated future benefit payments
2019		995
2020		1,046
2021		1,092
2022		1,177
2023		1,316
2024-2028		7,031
Employer contributions		$ 769	$ 733

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year.

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Amount of benefits for defined benefit plan expected to be paid in fourth fiscal year following latest fiscal year.

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