Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2016

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, 2016 and 2015:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Interest cost	$	166		$	165		$	501		$	496
Expected return on plan assets		(180	)		(186	)		(542	)		(559	)
Amortization of loss		77			294			538			882
Net periodic pension expense	$	63		$	273		$	497		$	819