Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2012

Retirement Benefits [Abstract]

Components of net periodic benefit cost

Components of Net Periodic Benefit Cost (in thousands of dollars)

	Pension Benefits						Other Benefits
Three Months Ended September 30,	2012			2011			2012			2011
Service cost	$	2,293		$	1,723		$	57		$	32
Interest cost		2,906			2,959			74			87
Expected return on plan assets		(3,243	)		(3,400	)		-			-
Amortization of prior service cost		232			236			13			13
Amortization of unrecognized net loss (gain)		2,203			979			(45	)		(56	)
Net periodic benefit cost	$	4,391		$	2,497		$	99		$	76
	Pension Benefits						Other Benefits
Nine Months Ended September 30,		2012			2011			2012			2011
Service cost	$	7,881		$	5,168		$	170		$	96
Interest cost		9,193			8,878			223			260
Expected return on plan assets		(9,727	)		(10,199	)		-			-
Amortization of prior service cost		697			709			38			38
Amortization of unrecognized net loss (gain)		7,508			2,936			(134	)		(167	)
Amortization of unrecognized transition asset		-			-			-			-
Net periodic benefit cost	$	15,552		$	7,492		$	297		$	227