Pension and Post-Retirement Benefit Costs (Tables)

3 Months Ended

Mar. 31, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost are as follows:

	Three Months Ended March 31,
	Pension						Post-retirement Healthcare
	2013			2012			2013		2012
Service cost	$	264		$	254		$	2	$	2
Interest cost	501			647			147		185
Expected return on plan assets	(714		)	(620		)	—		—
Amortization of prior service cost	74			74			21		21
Amortization of net loss	429			439			90		44
Net periodic benefit cost	$	554		$	794		$	260	$	252