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Pension And Other Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit credit for Company-sponsored pension plans, net of taxes, for the three and nine months ended September 30, 2017 and September 30, 2016 were as follows (in thousands):
 
Pension Benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2017
 
September 30, 2016
 
September 30, 2017
 
September 30, 2016
Service cost
$
192

 
$
173

 
$
576

 
$
519

Interest cost
19,549

 
20,681

 
58,646

 
62,043

Expected return on plans’ assets
(25,281
)
 
(26,905
)
 
(75,844
)
 
(80,713
)
Amortization of prior service costs
29

 
23

 
87

 
68

Net periodic benefit credit
$
(5,511
)
 
$
(6,028
)
 
$
(16,535
)
 
$
(18,083
)