Health Care, Pension and Other Benefits (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Costs (Credits) for Domestic Defined Benefit Pension Plans, Foreign Defined Benefit Pension Plans and Postretirement Benefits Other Than Pensions

Shown below are the components of the Company’s net periodic benefit (credit) cost for domestic defined benefit pension plans, foreign defined benefit pension plans and postretirement benefits other than pensions:

(Thousands of dollars)	Domestic Defined Benefit Pension Plans						Foreign Defined Benefit Pension Plans						Postretirement Benefits Other than Pensions
	2018			2017			2018			2017			2018			2017
Three Months Ended September 30:
Net periodic benefit (credit) cost:
Service cost	$	1,158		$	5,356		$	2,016		$	2,050		$	499		$	524
Interest cost	8,541			8,734			2,352			2,242			2,545			2,755
Expected return on assets	(14,383		)	(13,351		)	(2,685		)	(2,488		)
Recognition of:
Unrecognized prior service cost	407			341									(1,643		)	(1,645		)
Unrecognized actuarial loss				1,334			383			474			581			8
Net periodic benefit (credit) cost	$	(4,277	)	$	2,414		$	2,066		$	2,278		$	1,982		$	1,642
Nine Months Ended September 30:
Net periodic benefit (credit) cost:
Service cost	$	6,673		$	16,128		$	6,048		$	6,255		$	1,496		$	1,538
Interest cost	25,233			22,335			7,055			5,744			7,634			7,991
Expected return on assets	(43,199		)	(34,959		)	(8,055		)	(6,260		)
Recognition of:
Unrecognized prior service cost	1,192			1,022									(4,927		)	(4,935		)
Unrecognized actuarial loss				4,657			1,149			324			1,744			24
Ongoing pension (credit) cost	(10,101		)	9,183			6,197			6,063			5,947			4,618
Settlements and curtailments	825															(9,332		)
Net periodic benefit (credit) cost	$	(9,276	)	$	9,183		$	6,197		$	6,063		$	5,947		$	(4,714	)