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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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
 
2016
 
2015
 
(in thousands)
Service cost
$
2,124

 
$
2,403

Interest cost
26,219

 
24,631

Expected return on plan assets
(39,333
)
 
(37,675
)
Amortization of prior service credit
(108
)
 
(141
)
Amortization of actuarial loss
7,875

 
9,628

Net periodic benefit income
$
(3,223
)
 
$
(1,154
)

Net periodic benefit income for the pension plans included the following components for the six months ended June 30:
 
 
Pension Benefits
 
2016
 
2015
 
(in thousands)
Service cost
$
4,151

 
$
4,790

Interest cost
52,310

 
49,243

Expected return on plan assets
(78,471
)
 
(75,322
)
Amortization of prior service credit
(216
)
 
(282
)
Amortization of actuarial loss
15,670

 
19,241

Net periodic benefit income
$
(6,556
)
 
$
(2,330
)