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Employee Benefit Plans - Net Pension Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Components of net pension cost    
Service cost - benefits earned during the year $ 1,663 $ 1,857
Interest costs on projected benefit obligations 1,023 1,159
Expected return on plan assets (1,825) (1,572)
Expected administrative expenses 104 110
Amortization of prior service cost   50
Amortization of unrecognized net loss 181 218
Net periodic pension cost $ 1,146 $ 1,822