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Pension And Other Retirement Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit credit for Company-sponsored pension plans for the three and nine months ended September 30, 2018 and September 30, 2017 were as follows (in thousands):
 
Pension Benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2018
 
September 30, 2017
 
September 30, 2018
 
September 30, 2017
Service cost
$
234

 
$
192

 
$
701

 
$
576

Interest cost
17,784

 
19,549

 
53,353

 
58,646

Expected return on plans’ assets
(24,821
)
 
(25,281
)
 
(74,462
)
 
(75,844
)
Recognized actuarial loss
5

 
—

 
13

 
—

Amortization of prior service costs
35

 
29

 
105

 
87

Net periodic benefit credit
$
(6,763
)
 
$
(5,511
)
 
$
(20,290
)
 
$
(16,535
)