Retirement Benefits (Tables)

6 Months Ended

Jun. 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 June 30,	2012			2011			2012			2011
Service cost	$	3,437		$	1,775		$	57		$	17
Interest cost		3,382			2,908			74			96
Expected return on plan assets		(3,254	)		(3,397	)		-			-
Amortization of prior service cost		232			236			13			13
Amortization of unrecognized net loss (gain)		3,102			1,049			(45	)		(50	)
Net periodic benefit cost	$	6,899		$	2,571		$	99		$	76
	Pension Benefits						Other Benefits
Six Months Ended June 30,		2012			2011			2012			2011
Service cost	$	5,588		$	3,447		$	113		$	64
Interest cost		6,288			5,920			149			173
Expected return on plan assets		(6,484	)		(6,801	)		-			-
Amortization of prior service cost		465			473			26			25
Amortization of unrecognized net loss (gain)		5,305			1,958			(89	)		(111	)
Amortization of unrecognized transition asset		-			-			-			-
Net periodic benefit cost	$	11,162		$	4,997		$	199		$	151