Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

The components of net periodic benefit cost related to our benefit plans for the three and six months ended June 30, 2016 and 2015 consisted of the following:

	For the Three Months Ended						For the Six Months Ended
	June 30,						June 30,
	2016			2015			2016			2015
Components of net periodic benefit cost:
Service cost	$	951		$	997		$	1,903		$	1,993
Interest cost	1,409			1,255			2,818			2,511
Expected return on plan assets	(1,749		)	(1,583		)	(3,498		)	(3,165		)
Amortization of net loss	807			840			1,613			1,679
Net periodic benefit cost	$	1,418		$	1,509		$	2,836		$	3,018