Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2012

Retirement Plans [Abstract]

Schedule Of Components Of Periodic Benefit Costs For Defined-Benefit Pension, Postretirement Healthcare And Supplemental Retirement Plan

	Defined-Benefit Pension Plan Three-Month Period Ended March 31,						Postretirement Healthcare Plan Three-Month Period Ended March 31,				Supplemental Retirement Plan Three-Month Period Ended March 31,
	2012			2011			2012		2011		2012		2011
Service cost	$	215		$	194		$	8	$	10	$	7	$	5
Interest cost		476			455			18		20		40		40
Expected return on plan assets		(509	)		(513	)		—		—		—		—
Amortization of net loss		473			342			6		7		48		38
Net periodic benefit cost	$	655		$	478		$	32	$	37	$	95	$	83