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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 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 June 30:
 
Pension Benefits
 
2018
 
2017
Service cost
$
2,612

 
$
2,133

Interest cost
22,071

 
24,099

Expected return on plan assets
(38,516
)
 
(39,681
)
Amortization of prior service credit
(37
)
 
(87
)
Amortization of actuarial loss
9,935

 
9,466

Net periodic benefit income
$
(3,935
)
 
$
(4,070
)
Net periodic benefit income for the Company's pension plans included the following components for the six months ended June 30:
 
Pension Benefits
 
2018
 
2017
Service cost
$
5,266

 
$
4,290

Interest cost
44,184

 
48,231

Expected return on plan assets
(77,104
)
 
(79,414
)
Amortization of prior service credit
(74
)
 
(175
)
Amortization of actuarial loss
19,894

 
18,951

Net periodic benefit income
$
(7,834
)
 
$
(8,117
)