Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Benefit Plans [Abstract]

Components of net periodic benefit cost

PENSION BENEFITS	Three Months Ended March 31
in thousands	2012			2011
Components of Net Periodic Benefit Cost
Service cost		$5,587			$5,190
Interest cost		10,798			10,542
Expected return on plan assets		(12,195	)		(12,370	)
Amortization of prior service cost		69			85
Amortization of actuarial loss		4,882			2,824
Net periodic pension benefit cost		$9,141			$6,271
Pretax reclassification from AOCI included in net periodic pension benefit cost		$4,951			$2,909

OTHER POSTRETIREMENT BENEFITS	Three Months Ended March 31
in thousands	2012			2011
Components of Net Periodic Benefit Cost
Service cost		$1,166			$1,197
Interest cost		1,562			1,613
Amortization of prior service credit		(169	)		(169	)
Amortization of actuarial loss		287			287
Net periodic postretirement benefit cost		$2,846			$2,928
Pretax reclassification from AOCI included in net periodic postretirement benefit cost		$118			$118