Pension Plan and Other Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2013

Pension Plan And Other Postretirement Benefits [Abstract]

Net Periodic Pension and Other Postretirement Benefit Costs

	Pension Benefits
	For the three months ended				For the nine months ended
	September 30,				September 30,
	2013		2012		2013		2012
	(in thousands)
Service cost	$	3,447	$	2,736	$	10,342	$	8,207
Interest cost		1,026		1,013		3,078		3,038
Expected return on plan assets		(1,534)		(1,356)		(4,602)		(4,069)
Amortization of prior service cost		25		71		77		214
Amortization of net loss		386		305		1,156		915
Net periodic benefit cost	$	3,350	$	2,769	$	10,051	$	8,305
	Postretirement Benefits
	For the three months ended				For the nine months ended
	September 30,				September 30,
	2013		2012		2013		2012
	(in thousands)
Service cost	$	574	$	458	$	1,722	$	1,374
Interest cost		111		100		331		299
Amortization of transition obligation		–		16		–		48
Amortization of prior service cost		4		4		11		11
Amortization of net loss		30		23		90		69
Net periodic benefit cost	$	719	$	601	$	2,154	$	1,801