Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

Components of the net periodic pension and postretirement benefit cost for the three and nine months ended September 30, 2015 and 2014, respectively, are as follows:

	Three months ended						Nine months ended
	September 30,						September 30,
	2015			2014			2015			2014
Service cost	$	250		$	127		$	724		$	382
Interest cost	1,722			1,740			5,312			5,220
Expected return on assets	(2,494		)	(2,096		)	(7,128		)	(6,286		)
Amortization of prior service cost	(4		)	71			184			212
Amortization of actuarial loss	674			345			2,532			1,035
Curtailment charge	—			—			3,080			—
Net periodic pension and postretirement benefit cost	$	148		$	187		$	4,704		$	563
Contributions paid	$	—		$	—		$	—		$	—