Pension And Other Postretirement Benefit Plans (Tables)

3 Months Ended

Jun. 30, 2015

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)	2015			2014			2015			2014
Service cost	$	1,483		$	1,334		$	108		$	114
Interest cost	2,346			2,669			407			484
Expected return on plan assets	(3,576		)	(3,692		)	(15		)	(26		)
Net amortization and deferral	1,199			780			(44		)	(133		)
Net periodic benefit cost	$	1,452		$	1,091		$	456		$	439