Health Care, Pension and Other Benefits (Tables)

6 Months Ended

Jun. 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 June 30:
Net periodic benefit (credit) cost:
Service cost	$	1,158		$	5,459		$	2,016		$	2,287		$	499		$	471
Interest cost	8,540			7,191			2,351			1,864			2,544			2,593
Expected return on assets	(14,382		)	(11,299		)	(2,685		)	(2,008		)
Recognition of:
Unrecognized prior service cost	406			340									(1,642		)	(1,645		)
Unrecognized actuarial loss				1,662			383			(97		)	582			5
Ongoing pension (credit) cost	(4,278		)	3,353			2,065			2,046			1,983			1,424
Settlements																(9,332		)
Net pension (credit) cost	$	(4,278	)	$	3,353		$	2,065		$	2,046		$	1,983		$	(7,908	)
Six Months Ended June 30:
Net periodic benefit (credit) cost:
Service cost	$	5,515		$	10,772		$	4,032		$	4,205		$	997		$	1,014
Interest cost	16,692			13,601			4,703			3,502			5,089			5,236
Expected return on assets	(28,816		)	(21,608		)	(5,370		)	(3,772		)
Recognition of:
Unrecognized prior service cost	785			681									(3,284		)	(3,290		)
Unrecognized actuarial loss				3,323			766			(150		)	1,163			16
Ongoing pension (credit) cost	(5,824		)	6,769			4,131			3,785			3,965			2,976
Settlements and curtailments	825															(9,332		)
Net periodic benefit (credit) cost	$	(4,999	)	$	6,769		$	4,131		$	3,785		$	3,965		$	(6,356	)