Health Care, Pension and Other Benefits (Tables)

6 Months Ended

Jun. 30, 2011

Health Care, Pension and Other Benefits [Abstract]

Health care, pension and other benefits

(Thousands of dollars)	Domestic Defined						Foreign Defined						Postretirement Benefits
	Benefit Pension Plans						Benefit Pension Plans						Other than Pensions
	2011			2010			2011			2010			2011			2010
Three Months Ended June 30:
Net periodic benefit cost:
Service cost	$	4,007		$	4,264		$	961		$	488		$	874		$	883
Interest cost		4,707			4,574			1,094			1,003			3,895			4,016
Expected return on assets		(11,611	)		(10,640	)		(681	)		(695	)
Amortization of:
Prior service cost (credit)		409			415						7			(164	)		(164	)
Actuarial loss		4,877			4,781			220			333			626			326
Net periodic benefit cost	$	2,389		$	3,394		$	1,594		$	1,136		$	5,231		$	5,061
Six Months Ended June 30:
Net periodic benefit cost:
Service cost	$	8,014		$	8,453		$	1,896		$	989		$	1,748		$	1,766
Interest cost		9,414			9,014			2,164			2,039			7,790			8,033
Expected return on assets		(23,221	)		(21,155	)		(1,346	)		(1,410	)
Amortization of:
Prior service cost (credit)		818			830						14			(328	)		(328	)
Actuarial loss		9,754			9,472			435			680			1,252			652
Net periodic benefit cost	$	4,779		$	6,614		$	3,149		$	2,312		$	10,462		$	10,123