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Pension Reconciliation of Changed in Benefit Obligations, Plan Assets, and Funded Status of Pension Benefits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Curtailment gain due to plan freeze $ 0 $ 416 $ 0
Change in Benefit Obligation:      
Benefit Obligation at Beginning of Period 33,569 36,280  
Service Cost 209 302 375
Interest Cost 1,338 1,265 1,201
Actuarial Loss (Gain) 4,865 (2,645)  
Plan Amendments 1,728 0  
Plan Curtailments 0 (126)  
Benefits and Other Payments (1,513) (1,507)  
Benefit Obligation at End of Period 40,196 33,569 36,280
Change in Plan Assets:      
Fair Value of Plan Assets at Beginning of Period 0 0  
Company Contributions 1,513 1,507  
Benefits and Other Payments (1,513) (1,507)  
Fair Value of Plan Assets at End of Period 0 0 $ 0
Funded Status:      
Current Liabilities (1,587) (1,578)  
Noncurrent Liabilities (38,609) (31,991)  
Net Obligation Recognized (40,196) (33,569)  
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:      
Net Actuarial Loss 15,361 10,738  
Prior Service Cost (Credit) 1,727 (17)  
Total 17,088 10,721  
Net Amount Recognized 12,605 7,904  
Accumulated Defined Benefit Plans Adjustment Attributable to Parent      
Amounts Recognized in Accumulated Other Comprehensive Loss Consist of:      
Less: Tax Benefit $ 4,483 $ 2,817