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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2018

Defined Benefit Plan [Abstract]

Components of net periodic benefit cost for pension and postretirement benefit plans

The following tables set forth the components of net periodic benefit cost for our pension and postretirement benefit plans for the periods indicated:

	Pension Benefits
	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2018				2017				2018				2017
	(Thousands of dollars)
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	$	4,529			$	4,432			$	13,587			$	13,298

	Postretirement Benefits
	Three Months Ended								Nine Months Ended
	September 30,								September 30,
	2018				2017				2018				2017
	(Thousands of dollars)
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

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- References

No definition available.

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

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

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