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Pension and Other Post-Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Schedule of net periodic costs for the defined benefit pension plans and the post retirement healthcare plans
The following table sets forth the net periodic costs for the defined benefit pension plans and post-retirement healthcare plans for the periods indicated (in thousands):
 
Quarter ended March 31,
 
Pension benefits
 
Other post-retirement benefits
 
2020
 
2019
 
2020
 
2019
Service cost
$
2,098

 
1,274

 
—

 
—

Interest cost
1,714

 
1,827

 
7

 
11

Expected return on plan assets
(3,091
)
 
(2,759
)
 
—

 
—

Amortization of prior service cost
(581
)
 
(581
)
 
—

 
—

Amortization of the net loss
924

 
855

 
5

 
17

Net periodic cost
$
1,064

 
616

 
12

 
28