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Retirement Plans - Components Of Net Periodic Pension Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Components of net periodic pension cost and other amounts recognized in other comprehensive income    
Net periodic pension expense   $ (309)
Other Comprehensive Income    
Components of net periodic pension cost and other amounts recognized in other comprehensive income    
Interest cost $ 1,157 1,079
Service cost 121 78
Expected return on plan assets (2,361) (2,328)
Recognized net actuarial loss 483 775
Net periodic pension expense (600) (396)
Plan termination settlements 10,126  
Net periodic pension cost with settlement 9,526  
Net (gain) loss 2,722 (581)
Amortization of gain (loss) (483) (775)
Plan termination settlement adjustment (10,126)  
Total amount recognized in other comprehensive income (7,887) (1,356)
Total recognized in net periodic benefit cost and other comprehensive income $ 1,639 $ (1,752)