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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Pension Benefits
Components of net periodic benefit cost
Service cost	$ 1,832	$ 1,721	$ 5,496	$ 5,165
Interest cost	4,408	4,655	13,224	13,965
Expected return on plan assets	(5,969)	(5,336)	(17,907)	(16,008)
Amortization of net loss	4,258	3,392	12,774	10,176
Net periodic benefit cost (income)	4,529	4,432	13,587	13,298
Other Postretirement Benefits Plan [Member]
Components of net periodic benefit cost
Service cost	211	165	633	495
Interest cost	527	565	1,581	1,695
Expected return on plan assets	(672)	(564)	(2,016)	(1,692)
Amortization of prior service credit	(415)	(415)	(1,245)	(1,245)
Amortization of net loss	334	419	1,002	1,259
Net periodic benefit cost (income)	$ (15)	$ 170	$ (45)	$ 512

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ 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 (h)(4)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

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-Publisher FASB
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-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

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-Publisher FASB
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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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