Pension and Other Postretirement Benefits

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Pension and Other Postretirement Benefits

Pension and Other Postretirement Benefits

The components of net periodic benefit cost are as follows (in thousands):

	Pension Benefits						Other Postretirement Benefits
	For the three months ended June 30,						For the three months ended June 30,
	2015			2014			2015			2014
Components of net periodic benefit cost:
Service cost	$	2,178		$	1,701		$	1,875		$	1,944
Interest cost	3,297			3,316			6,351			7,726
Expected return on plan assets	(3,696		)	(4,553		)	—			—
Amortization of prior service cost (credit)	169			61			(1,552		)	307
Amortization of net actuarial loss	1,865			550			5,659			3,892
Settlement loss	—			843			—			—
Net periodic benefit cost	$	3,813		$	1,918		$	12,333		$	13,869

	Pension Benefits						Other Postretirement Benefits
	For the six months ended June 30,						For the six months ended June 30,
	2015			2014			2015			2014
Components of net periodic benefit cost:
Service cost	$	4,356		$	3,402		$	3,750		$	3,888
Interest cost	6,594			6,664			12,702			15,452
Expected return on plan assets	(7,392		)	(9,106		)	—			—
Amortization of prior service cost (credit)	338			122			(3,104		)	614
Amortization of net actuarial loss	3,730			1,192			11,318			7,784
Settlement loss	—			1,627			—			—
Net periodic benefit cost	$	7,626		$	3,901		$	24,666		$	27,738