Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Income for the Pension Plans

Net periodic benefit income for the pension plans included the following components for the three months ended June 30:

	Pension Benefits
	2015			2014
	(in thousands)
Service cost	$	2,403		$	1,927
Interest cost		24,631			25,530
Expected return on plan assets		(37,675	)		(36,234	)
Amortization of prior service credit		(141	)		(468	)
Amortization of actuarial loss		9,628			6,613
Net periodic benefit income	$	(1,154	)	$	(2,632	)

Net periodic benefit income for the pension plans included the following components for the six months ended June 30:

	Pension Benefits
	2015			2014
	(in thousands)
Service cost	$	4,790		$	3,836
Interest cost		49,243			51,032
Expected return on plan assets		(75,322	)		(72,431	)
Amortization of prior service credit		(282	)		(932	)
Amortization of actuarial loss		19,241			13,208
Net periodic benefit income	$	(2,330	)	$	(5,287	)