Employee Benefits

3 Months Ended

Mar. 31, 2015

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,	2015			2014			2015		2014
Net periodic benefit cost
Service cost	$	1,669		$	1,303		$	1,305	$	924
Interest cost	1,500			1,468			713		586
Expected return on plan assets	(1,950		)	(1,739		)	—		—
Amortization of net loss	1,136			544			731		224
Net periodic benefit cost	$	2,355		$	1,576		$	2,749	$	1,734

Employer Contributions

We previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2014 that we expected to contribute $6,352 to the pension plan in 2015. For the three-month period ended March 31, 2015, we contributed $1,565 to the pension plan. We anticipate that the total contribution in 2015 will not vary significantly from our expected contribution.