Employee Benefits

3 Months Ended

Mar. 31, 2016

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

EMPLOYEE BENEFITS

Net Periodic Benefit Cost

The components of the net periodic benefit cost for our pension and postretirement benefit plans are as follows:

	Pension Plan						Postretirement Benefit Plan
Three Months Ended March 31,	2016			2015			2016		2015
Net periodic benefit cost
Service cost	$	1,623		$	1,669		$	932	$	1,305
Interest cost	1,663			1,500			754		713
Expected return on plan assets	(1,988		)	(1,950		)	—		—
Amortization of net loss	992			1,136			379		731
Net periodic benefit cost	$	2,290		$	2,355		$	2,065	$	2,749

Employer Contributions

We previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2015 that we expected to contribute $6,384 to the pension plan in 2016. For the three-month period ended March 31, 2016, we contributed $1,595 to the pension plan. We anticipate that the total contribution in 2016 will not vary significantly from our expected contribution.