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Pension Plans And Other Postretirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Post-retirement Benefits
 
2017
 
2016
 
2017
 
2016
Three months ended March 31:
 
 
 
 
 
 
 
Service cost
$
5,042

 
$
4,519

 
$
824

 
$
779

Interest cost
6,951

 
6,900

 
1,399

 
1,559

Expected return on plan assets
(7,900
)
 
(6,750
)
 
(475
)
 
(475
)
Amortization of prior service cost
—

 
—

 
(312
)
 
(312
)
Net loss recognition
2,546

 
1,890

 
1,273

 
1,365

Net periodic benefit cost
$
6,639

 
$
6,559

 
$
2,709

 
$
2,916