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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31:
 
 
Pension Benefits
 
2018
 
2017
Service cost
$
2,654

 
$
2,157

Interest cost
22,113

 
24,132

Expected return on plan assets
(38,588
)
 
(39,733
)
Amortization of prior service credit
(37
)
 
(88
)
Amortization of actuarial loss
9,959

 
9,485

Net periodic benefit income
$
(3,899
)
 
$
(4,047
)