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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Net Periodic Pension Cost
Net periodic pension cost for the three and six months ended June 30, 2020 and 2019 included the following components
:
 
 
  
Three Months Ended

June 30
 
  
Six Months Ended

June 30
 
 
  
2020
 
  
2019
 
  
2020
 
  
2019
 
Service cost
  
$
 715
 
  
$
 561
 
  
$
 1,430
 
  
$
 1,116
 
Interest cost
  
 
1,286
 
 
 
1,459
 
 
 
2,573
 
 
 
2,901
 
Expected return on plan assets
  
 
(2,630
) 
 
 
(2,356
) 
 
 
(5,259
) 
 
 
(4,686
) 
Recognized net actuarial loss
  
 
1,442
 
 
 
1,184
 
 
 
2,884
 
 
 
2,355
 
  
 
 
    
 
 
    
 
 
    
 
 
  
Net periodic pension cost
  
$
813
 
 
$
848
 
 
$
1,628
 
 
$
1,686
 
  
 
 
    
 
 
    
 
 
    
 
 
  
Weighted-Average Assumptions:
  
 
 
 
Discount rate
  
 
3.42
% 
 
 
4.52
% 
 
 
3.42
% 
 
 
4.52
% 
Expected return on assets
  
 
6.75
% 
 
 
7.00
% 
 
 
6.75
% 
 
 
7.00
% 
Rate of
c
ompensation
i
ncrease (prior to age 40)
  
 
5.00
% 
 
 
n/a
 
 
 
5.00
% 
 
 
n/a
 
Rate of
c
ompensation
i
ncrease (ages
40-54)
  
 
4.00
% 
 
 
n/a
 
 
 
4.00
% 
 
 
n/a
 
Rate of compensation increase (prior to age 45)
  
 
n/a
 
 
 
3.50
% 
 
 
n/a
 
 
 
3.50
% 
Rate of compensation increase
 
(otherwise)
  
 
3.50
% 
 
 
3.00
% 
 
 
3.50
% 
 
 
3.00
%