Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2013

Compensation And Retirement Disclosure [Abstract]

Summary of Net Periodic Pension Expense for ACS Retirement Plan

The following table presents the net periodic pension expense for the ACS Retirement Plan for the three and nine-month periods ended September 30, 2013 and 2012:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Interest cost	$	160		$	179		$	480		$	466
Expected return on plan assets		(180	)		(174	)		(541	)		(440	)
Amortization of loss		205			199			612			532
Net periodic pension expense	$	185		$	204		$	551		$	558