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Pension Plans And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Post-retirement Benefits
 
2015
 
2014
 
2015
 
2014
Three months ended March 31:
 
 
 
 
 
 
 
Service cost
$
4,949

 
$
5,018

 
$
699

 
$
974

Interest cost
6,672

 
6,706

 
1,331

 
1,353

Expected return on plan assets
(7,416
)
 
(8,110
)
 
(431
)
 
(472
)
Amortization of prior service cost
6

 
6

 
(279
)
 
(43
)
Net loss recognition
2,394

 
1,157

 
1,292

 
826

Net periodic benefit cost
$
6,605

 
$
4,777

 
$
2,612

 
$
2,638