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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Income for the Pension Plans
Net periodic benefit income for the Company's pension plans included the following components for the three months ended September 30:
 
Pension Benefits
 
2018
 
2017
Service cost
$
2,584

 
$
2,240

Interest cost
22,044

 
24,243

Expected return on plan assets
(38,470
)
 
(38,061
)
Amortization of prior service credit
(37
)
 
(88
)
Amortization of actuarial loss
9,920

 
9,549

Net periodic benefit income
$
(3,959
)
 
$
(2,117
)
Net periodic benefit income for the Company's pension plans included the following components for the nine months ended September 30:
 
Pension Benefits
 
2018
 
2017
Service cost
$
7,850

 
$
6,530

Interest cost
66,228

 
72,474

Expected return on plan assets
(115,574
)
 
(117,475
)
Amortization of prior service credit
(111
)
 
(263
)
Amortization of actuarial loss
29,814

 
28,500

Net periodic benefit income
$
(11,793
)
 
$
(10,234
)