Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2019

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The following table summarizes key information related to the Company’s pension plans and other postretirement benefits:

	Pension Benefits						Pension Benefits						Other Postretirement Benefits						Other Postretirement Benefits
	Three Months Ended						Six Months Ended						Three Months Ended						Six Months Ended
	June 30,						June 30,						June 30,						June 30,
	2019			2018			2019			2018			2019			2018			2019			2018
Service cost — benefits earned during the period	$	134		$	147		$	267		$	294		$	1		$	—		$	1		$	1
Interest cost on projected benefit obligation	1,215			1,124			2,430			2,246			87			82			173			164
Expected return on assets	(1,219		)	(1,393		)	(2,437		)	(2,786		)	—			—			—			—
Amortization of prior service cost	—			—			—			—			1			—			2			—
Amortization of net loss (gain)	501			451			1,002			903			(10		)	(10		)	(54		)	(20		)
Net expense	$	631		$	329		$	1,262		$	657		$	79		$	72		$	122		$	145