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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Pension Benefits
Components of net periodic benefit cost
Service cost	$ 1,832	$ 1,722	$ 3,664	$ 3,444
Interest cost	4,408	4,655	8,816	9,310
Expected return on plan assets	(5,969)	(5,336)	(11,938)	(10,672)
Amortization of net loss	4,258	3,392	8,516	6,784
Net periodic benefit cost (income)	4,529	4,433	9,058	8,866
Other Postretirement Benefits Plan [Member]
Components of net periodic benefit cost
Service cost	211	165	422	330
Interest cost	527	565	1,054	1,130
Expected return on plan assets	(672)	(564)	(1,344)	(1,128)
Amortization of prior service credit	(415)	(415)	(830)	(830)
Amortization of net loss	334	420	668	840
Net periodic benefit cost (income)	$ (15)	$ 171	$ (30)	$ 342

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
-Subparagraph (h)(5)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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X

- 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
-Name Accounting Standards Codification
-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
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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Amount of net periodic benefit cost (credit) for defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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