Pension And Other Postretirement Benefit Plans (Tables)

3 Months Ended

Jun. 30, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of Company's Net Periodic Benefit Cost

The components of the Company’s net periodic benefit cost were as follows:

	Pension Benefits						Other Postretirement Benefits
	Three Months Ended June 30,						Three Months Ended June 30,
(in thousands of dollars)	2013			2012			2013			2012
Service cost	$	1,195		$	1,224		$	138		$	148
Interest cost	2,857			3,166			532			576
Expected return on plan assets	(3,542		)	(3,497		)	(30		)	(31		)
Net amortization and deferral	2,447			2,518			(17		)	52
Net periodic benefit cost	$	2,957		$	3,411		$	623		$	745