Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2013

Pension and Other Postretirement Benefits

Components of net periodic benefit costs

The components of net periodic benefit cost are as follows (in thousands):

	Pension Benefits						Other Postretirement Benefits
	For the three months ended March 31,						For the three months ended March 31,
	2013			2012			2013		2012
Components of net periodic benefit cost:
Service cost	$	1,766		$	1,498		$	2,486	$	2,018
Interest cost		3,070			3,129			7,198		7,253
Expected return on plan assets		(4,235	)		(4,031	)		—		—
Amortization of prior service cost		66			64			307		261
Amortization of net actuarial loss		2,434			2,313			4,734		3,681
Net periodic benefit cost	$	3,101		$	2,973		$	14,725	$	13,213