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Pension Plans And Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Components of Net Periodic Benefit Cost
 
Pension Benefits
 
Other Post-retirement Benefits
 
2017
 
2016
 
2017
 
2016
Three months ended June 30:
 
 
 
 
 
 
 
Service cost
$
5,092

 
$
4,569

 
$
799

 
$
804

Interest cost
6,976

 
6,900

 
1,374

 
1,534

Expected return on plan assets
(7,900
)
 
(6,875
)
 
(475
)
 
(475
)
Amortization of prior service cost
—

 
—

 
(312
)
 
(312
)
Net loss recognition
2,317

 
2,201

 
1,320

 
1,494

Net periodic benefit cost
$
6,485

 
$
6,795

 
$
2,706

 
$
3,045

Six months ended June 30:
 
 
 
 
 
 
 
Service cost
$
10,134

 
$
9,088

 
$
1,623

 
$
1,583

Interest cost
13,927

 
13,800

 
2,773

 
3,093

Expected return on plan assets
(15,800
)
 
(13,625
)
 
(950
)
 
(950
)
Amortization of prior service cost
—

 
—

 
(624
)
 
(624
)
Net loss recognition
4,863

 
4,091

 
2,593

 
2,859

Net periodic benefit cost
$
13,124

 
$
13,354

 
$
5,415

 
$
5,961