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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Income for the Pension Plans
Net periodic benefit income from the Company's pension plans included the following components for the three months ended June 30:
 
 
Pension Benefits
 
 
2019
 
2018
Service cost
 
$
2,379

 
$
2,612

Interest cost
 
24,335

 
22,071

Expected return on plan assets
 
(38,507
)
 
(38,516
)
Amortization of prior service credit
 
(17
)
 
(37
)
Amortization of actuarial loss
 
7,746

 
9,935

Net periodic benefit income
 
$
(4,064
)
 
$
(3,935
)

Net periodic benefit income from the Company's pension plans included the following components for the six months ended June 30:
 
 
Pension Benefits
 
 
2019
 
2018
Service cost
 
$
4,769

 
$
5,266

Interest cost
 
48,683

 
44,184

Expected return on plan assets
 
(77,034
)
 
(77,104
)
Amortization of prior service credit
 
(34
)
 
(74
)
Amortization of actuarial loss
 
15,495

 
19,894

Net periodic benefit income
 
$
(8,121
)
 
$
(7,834
)