Pension and Post-Retirement Benefit Costs (Tables)

6 Months Ended

Jun. 30, 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 June 30,										Six Months Ended June 30,
	Pension						Post-retirement Healthcare				Pension						Post-retirement Healthcare
	2013			2012			2013		2012		2013			2012			2013		2012
Service cost	$	275		$	250		$	2	$	2	$	539		$	504		$	5	$	5
Interest cost	515			645			147		185		1,016			1,291			294		370
Expected return on plan assets	(713		)	(623		)	—		—		(1,427		)	(1,244		)	—		—
Amortization of prior    service cost	74			74			21		21		148			148			42		42
Amortization of net loss	510			445			90		44		940			884			179		88
Net periodic benefit cost	$	661		$	791		$	260	$	252	$	1,216		$	1,583		$	520	$	505