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Employee Benefit Plans (Narratives) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Employee Benefit Plans Disclosure [Abstract]    
Defined Contribution Plan Payments In Current Fiscal Year $ 500,000 $ 600,000
Defined Benefit Plan, Accumulated Benefit Obligation 18,700,000 21,100,000
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 700,000  
Defined Benefit Plan Increase (Decrease) In Discount Rate Percentage 1.00%  
Defined Benefit Plan Increase (Decrease) In Discount Rate Value $ 9,000  
Defined Benefit Plan Increase (Decrease) In Asset Return Percentage 1.00%  
Defined Benefit Plan Average Remaining Work Lifetime 15 years  
Defined Benefit Plan Increase (Decrease) In Asset Return Value $ 178,000,000  
Defined Benefit Plan Payments In Current Fiscal Year 741,000 689,000
Defined Benefit Plans Liabilities Noncurrent 900,000  
Unrealized losses on pension benefit obligation, net of tax (226,000) $ (1,500,000)
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]    
Expected Future Benefit Payments, 2019 600,000  
Expected Future Benefit Payments, 2020 500,000  
Expected Future Benefit Payments, 2021 500,000  
Expected Future Benefit Payments, 2022 600,000  
Expected Future Benefit Payments, 2023 700,000  
Expected Future Benefit Payments years, 2024-2028 $ 4,000,000