Pension and Post-Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Pension and Post-retirement Benefit Costs

Net pension benefit cost (in thousands) consisted of the following for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended   June 30,						Six Months Ended June 30,
	2018			2017			2018			2017
Service cost	$	322		$	149		$	601		$	444
Interest cost	1,158			571			2,136			1,454
Expected return on plan assets	(1,491		)	(757		)	(2,734		)	(2,088		)
Net amortization and deferral	631			255			1,264			948
Net pension benefit costs	$	620		$	218		$	1,267		$	758

Net post-retirement benefit cost (in thousands) consisted of the following for the three and six months ended June 30, 2018 and 2017:

	Three Months Ended   June 30,					Six Months Ended June 30,
	2018		2017			2018			2017
Service cost	$	27	$	33		$	54		$	65
Interest cost	188		191			376			383
Expected return on plan assets	—		(1		)	(1		)	(1		)
Net amortization and deferral	—		53			—			107
Net post-retirement benefit costs	$	215	$	276		$	429		$	554