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Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit costs for the defined benefit plans and other postretirement benefits for the three and six months ended June 30, 2021, and 2020 are as follows:
 Three months ended June 30,Six months ended June 30,
 2021202020212020
Service cost$2,688 2,337 $5,423 4,780 
Interest cost2,530 2,816 5,110 5,720 
Expected return on assets(4,742)(4,183)(9,494)(8,303)
Unrecognized actuarial loss1,794 1,834 3,574 2,592 
Amortization of prior service cost13 (665)25 76 
Total$2,283 2,139 $4,638 4,865