Annual report pursuant to Section 13 and 15(d)

Pension and Other Postretirement Benefits - Summary of Net Periodic Benefits Cost (Details)

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Pension and Other Postretirement Benefits - Summary of Net Periodic Benefits Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of net periodic benefit cost:      
Service cost $ 3,225 $ 1,835 $ 666
Interest cost 264 210 197
Expected return on Pension Plan assets (521) (454) (364)
Amortization of net loss 144 66 46
Net periodic benefit cost $ 3,112 $ 1,657 $ 545