Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2014

Compensation and Retirement Disclosure [Abstract]

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,	2014			2013			2014		2013
Net periodic benefit cost
Service cost	$	1,303		$	1,575		$	924	$	1,401
Interest cost	1,468			1,295			586		472
Expected return on plan assets	(1,739		)	(1,443		)	—		—
Amortization of net loss	544			1,530			224		385
Net periodic benefit cost	$	1,576		$	2,957		$	1,734	$	2,258

	Pension Plan						Postretirement Benefit Plan
Nine Months Ended September 30,	2014			2013			2014		2013
Net periodic benefit cost
Service cost	$	3,909		$	4,725		$	2,772	$	2,906
Interest cost	4,404			3,883			1,758		1,319
Expected return on plan assets	(5,217		)	(4,329		)	—		—
Amortization of net loss	1,632			3,741			672		659
Net periodic benefit cost	$	4,728		$	8,020		$	5,202	$	4,884