Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

Components of the net periodic pension and postretirement benefit cost are as follows:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Service cost	$	112		$	250		$	336		$	724
Interest cost	1,312			1,722			3,936			5,312
Expected return on assets	(2,035		)	(2,494		)	(6,105		)	(7,128		)
Amortization of prior service cost	50			(4		)	150			184
Amortization of actuarial loss	406			674			1,218			2,532
Curtailment charge	—			—			—			3,080
Net periodic pension and postretirement benefit (credit) cost	$	(155	)	$	148		$	(465	)	$	4,704
Contributions paid	$	—		$	—		$	—		$	—