Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Net periodic pension cost

Net periodic pension cost is as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Interest cost	$	56		$	63		$	112		$	126
Expected return on assets		(79	)		(74	)		(158	)		(148	)
Amortization of net loss		21			24			42			48
Net periodic pension cost	$	(2	)	$	13		$	(4	)	$	26