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Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Components of Net Periodic Benefit Cost          
Service cost $ 313 $ 250 $ 627 $ 499 $ 998
Interest cost 326 348 653 696 $ 1,393
Net loss 135 53 270 105  
Net periodic pension cost $ 774 $ 651 $ 1,550 $ 1,300