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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
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 March 31:
 
 
Pension Benefits
 
 
2019
 
2018
Service cost
 
$
2,390

 
$
2,654

Interest cost
 
24,348

 
22,113

Expected return on plan assets
 
(38,527
)
 
(38,588
)
Amortization of prior service credit
 
(17
)
 
(37
)
Amortization of actuarial loss
 
7,749

 
9,959

Net periodic benefit income
 
$
(4,057
)
 
$
(3,899
)