Pension and Post-Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [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 months ended March 31, 2016 and 2015 are as follows:

	Three Months Ended   March 31,
	2016			2015
Service cost	$	288		$	324
Interest cost	1,235			1,203
Expected return on plan assets	(1,392		)	(1,375		)
Net amortization and deferral	481			666
Net pension benefit costs	$	612		$	818

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 months ended March 31, 2016 and 2015 are as follows:

	Three Months Ended   March 31,
	2016		2015
Service cost	$	44	$	44
Interest cost	306		277
Expected return on plan assets	—		(1		)
Net amortization and deferral	135		96
Net post-retirement costs	$	485	$	416