Pension and Post-Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2017

Retirement Benefits [Abstract]

Summarizes Information about Pension and Post-Retirement Benefit Plans

We maintain a single-employer noncontributory defined benefit pension plan covering certain employees. Net pension benefit cost (in thousands) recognized for the three and six months ended June 30, 2017 and 2016 are as follows:

	Three Months Ended   June 30,						Six Months Ended   June 30,
	2017			2016			2017			2016
Service cost	$	149		$	3		$	444		$	291
Interest cost	571			13			1,454			1,248
Expected return on plan assets	(757		)	(15		)	(2,088		)	(1,407		)
Net amortization and deferral	255			7			948			489
Net pension benefit costs	$	218		$	8		$	758		$	621

In addition, we provide defined benefit post-retirement health care and life insurance benefits to some employees. Net periodic post-retirement benefit cost (in thousands) recognized for the three and six months ended June 30, 2017 and 2016 are as follows:

	Three Months Ended   June 30,					Six Months Ended   June 30,
	2017			2016		2017			2016
Service cost	$	33		$	44	$	65		$	89
Interest cost	191			306		383			613
Expected return on plan assets	(1		)	—		(1		)	(1		)
Special termination benefit	—			21		—			21
Net amortization and deferral	53			135		107			269
Net post-retirement costs	$	276		$	506	$	554		$	991