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Pension Plans and Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
Components of net periodic benefit cost (benefit) included in net income are as follows:
 
Pension Benefits
 
Other Benefits
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
(In thousands)
Service cost
$
2,555

 
$
3,243

 
$
9,329

 
$
9,724

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost
12,253

 
12,765

 
36,017

 
38,369

 
249

 
240

 
748

 
743

Expected return on plan assets
(16,631
)
 
(15,861
)
 
(49,986
)
 
(47,571
)
 
—

 
—

 
—

 
—

Amortization of prior service cost (credit)
99

 
125

 
299

 
375

 
—

 
—

 
—

 
—

Net periodic benefit cost (benefit)
$
(1,724
)
 
$
272

 
$
(4,341
)
 
$
897

 
$
249

 
$
240

 
$
748

 
$
743