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Pension And Other Retirement Plans (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018 and June 30, 2017 were as follows (in thousands):
 
Pension Benefits
 
Three Months Ended
 
Six Months Ended
 
June 30, 2018
 
June 30, 2017
 
June 30, 2018
 
June 30, 2017
Service cost
$
174

 
$
198

 
$
467

 
$
384

Interest cost
17,829

 
19,528

 
35,569

 
39,097

Expected return on plans’ assets
(24,823
)
 
(25,236
)
 
(49,641
)
 
(50,563
)
Recognized actuarial loss
8

 
—

 
8

 
—

Amortization of prior service costs
35

 
35

 
70

 
58

Net periodic benefit credit
$
(6,777
)
 
$
(5,475
)
 
$
(13,527
)
 
$
(11,024
)