Employee Benefits

9 Months Ended

Sep. 30, 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 September 30,	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

	Pension Plan						Postretirement Benefit Plan
Nine Months Ended September 30,	2015			2014			2015		2014
Net periodic benefit cost
Service cost	$	5,007		$	3,909		$	3,915	$	2,772
Interest cost	4,500			4,404			2,139		1,758
Expected return on plan assets	(5,850		)	(5,217		)	—		—
Amortization of net loss	3,408			1,632			2,193		672
Net periodic benefit cost	$	7,065		$	4,728		$	8,247	$	5,202

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 nine-month period ended September 30, 2015, we contributed $6,352 to the pension plan. We anticipate that the total contribution in 2015 will not vary significantly from our expected contribution.