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Pension Plans And Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Post-retirement Benefits
 
2015
 
2014
 
2015
 
2014
Three months ended September 30:
 
 
 
 
 
 
 
Service cost
$
4,984

 
$
3,868

 
$
721

 
$
499

Interest cost
6,531

 
6,706

 
1,292

 
1,353

Expected return on plan assets
(7,075
)
 
(8,110
)
 
(500
)
 
(472
)
Amortization of prior service cost
6

 
6

 
(287
)
 
(43
)
Net loss recognition
2,397

 
1,163

 
1,324

 
826

Net periodic benefit cost
$
6,843

 
$
3,633

 
$
2,550

 
$
2,163

Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
14,917

 
$
12,754

 
$
2,141

 
$
1,972

Interest cost
19,734

 
20,118

 
3,915

 
4,059

Expected return on plan assets
(21,566
)
 
(24,330
)
 
(1,431
)
 
(1,416
)
Amortization of prior service cost
18

 
18

 
(853
)
 
(129
)
Net loss recognition
7,425

 
2,334

 
3,879

 
2,001

Net periodic benefit cost
$
20,528

 
$
10,894

 
$
7,651

 
$
6,487