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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
 
 
Pension Benefits
 
Other Benefits
(In thousands)
 
2014
 
2013
 
2014
 
2013
Three Months Ended March 31,
 
 
 
 
 
 
 
 
Service cost
 
$
2,481

 
$
2,784

 
$
156

 
$
172

Interest cost
 
4,891

 
4,468

 
299

 
262

Expected return on plan assets
 
(8,251
)
 
(7,725
)
 
—

 
—

Amortization of prior service cost
 
21

 
26

 
(84
)
 
(106
)
Recognized net actuarial losses
 
2,203

 
3,327

 
83

 
138

Settlement / Curtailment loss
 
57

 
—

 
—

 
—

Net periodic benefit cost
 
1,402

 
2,880

 
454

 
466