Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Pension and Other Postretirement Benefits

Components of net periodic benefit cost

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

	Pension Benefits						Other Postretirement Benefits
	For the three months ended September 30,						For the three months ended September 30,
	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			7,200		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			4,714		3,681
Net periodic benefit cost	$	3,101		$	2,973		$	14,707	$	13,213

	Pension Benefits						Other Postretirement Benefits
	For the nine months ended September 30,						For the nine months ended September 30,
	2013			2012			2013		2012
Components of net periodic benefit cost:
Service cost	$	5,298		$	4,494		$	7,458	$	6,054
Interest cost		9,210			9,387			21,596		21,759
Expected return on plan assets		(12,705	)		(12,093	)		—		—
Amortization of prior service cost		198			192			921		783
Amortization of net actuarial loss		7,302			6,939			14,182		11,043
Net periodic benefit cost	$	9,303		$	8,919		$	44,157	$	39,639