Health Care, Pension and Other Benefits (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit costs for pension and other employee benefit plans

Shown below are the components of the Company’s net periodic benefit cost (credit) 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
	2015			2014			2015			2014			2015			2014
Three Months Ended September 30:
Net periodic benefit cost (credit):
Service cost	$	5,754		$	5,636		$	1,326		$	1,547		$	621		$	609
Interest cost	6,236			6,526			2,271			2,695			2,795			3,195
Expected return on assets	(13,023		)	(12,666		)	(2,431		)	(2,739		)
Amortization of:
Prior service cost (credit)	327			459									(1,132		)	(126		)
Actuarial loss	844						485			356			253
Net periodic benefit cost (credit)	$	138		$	(45	)	$	1,651		$	1,859		$	2,537		$	3,678
Nine Months Ended September 30:
Net periodic benefit cost (credit):
Service cost	$	17,263		$	16,910		$	3,976		$	4,642		$	1,863		$	1,826
Interest cost	18,710			19,577			6,813			8,083			8,386			9,586
Expected return on assets	(39,071		)	(37,997		)	(7,292		)	(8,219		)
Amortization of:
Prior service cost (credit)	982			1,377									(3,396		)	(377		)
Actuarial loss	2,530						1,454			1,067			759
Net periodic benefit cost (credit)	$	414		$	(133	)	$	4,951		$	5,573		$	7,612		$	11,035