Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2012

Benefit Plans [Abstract]

Components of net periodic benefit cost

PENSION BENEFITS	Three Months Ended June 30						Six Months Ended June 30
in thousands	2012			2011			2012			2011
Components of Net Periodic Benefit Cost
Service cost		$5,588			$5,191			$11,175			$10,381
Interest cost		10,799			10,650			21,597			21,192
Expected return on plan assets		(12,195	)		(12,370	)		(24,390	)		(24,740	)
Amortization of prior service cost		68			85			137			170
Amortization of actuarial loss		4,881			3,011			9,763			5,835
Net periodic pension benefit cost		$9,141			$6,567			$18,282			$12,838
Pretax reclassification from AOCI included in net periodic pension benefit cost		$4,949			$3,096			$9,900			$6,005

OTHER POSTRETIREMENT BENEFITS	Three Months Ended June 30						Six Months Ended June 30
in thousands	2012			2011			2012			2011
Components of Net Periodic Benefit Cost
Service cost		$1,167			$1,198			$2,333			$2,395
Interest cost		1,562			1,612			3,124			3,225
Amortization of prior service credit		(168	)		(168	)		(337	)		(337	)
Amortization of actuarial loss		288			287			575			574
Net periodic postretirement benefit cost		$2,849			$2,929			$5,695			$5,857
Pretax reclassification from AOCI included in net periodic postretirement benefit cost		$120			$119			$238			$237