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Pension Plans And Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Post-retirement Benefits
 
2016
 
2015
 
2016
 
2015
Three months ended September 30:
 
 
 
 
 
 
 
Service cost
$
4,567

 
$
4,984

 
$
806

 
$
721

Interest cost
6,895

 
6,531

 
1,530

 
1,292

Expected return on plan assets
(6,887
)
 
(7,075
)
 
(465
)
 
(500
)
Amortization of prior service cost
1

 
6

 
(300
)
 
(287
)
Net loss recognition
2,161

 
2,397

 
1,453

 
1,324

Net periodic benefit cost
$
6,737

 
$
6,843

 
$
3,024

 
$
2,550

Nine months ended September 30:
 
 
 
 
 
 
 
Service cost
$
13,655

 
$
14,917

 
$
2,389

 
$
2,141

Interest cost
20,695

 
19,734

 
4,623

 
3,915

Expected return on plan assets
(20,512
)
 
(21,566
)
 
(1,415
)
 
(1,431
)
Amortization of prior service cost
1

 
18

 
(924
)
 
(853
)
Net loss recognition
6,252

 
7,425

 
4,312

 
3,879

Net periodic benefit cost
$
20,091

 
$
20,528

 
$
8,985

 
$
7,651