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Pension And Other Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016 and September 30, 2015 were as follows (in thousands):
 
Pension Benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2016
 
September 30, 2015
 
September 30, 2016
 
September 30, 2015
Service cost
$
173

 
$
177

 
$
519

 
$
531

Interest cost
20,681

 
20,453

 
62,043

 
61,361

Expected return on plans’ assets
(26,905
)
 
(27,922
)
 
(80,713
)
 
(83,767
)
Amortization of prior service costs
23

 
—

 
68

 
—

Net periodic benefit credit
$
(6,028
)
 
$
(7,292
)
 
$
(18,083
)
 
$
(21,875
)