Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2012

Retirement Plans [Abstract]

Summary of net periodic pension expense for the ACS Retirement Plan

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Interest cost	$	179		$	187		$	466		$	562
Expected return on plan assets		(174	)		(213	)		(440	)		(639	)
Amortization of loss		199			183			541			550
Net periodic pension expense	$	204		$	157		$	567		$	473