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Employee Benefit Plans (Amounts Recognized in the Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Noncurrent liabilities $ (7,045) $ (6,510)
Net amount recognized at December 31 $ (7,045) (6,510)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Current liabilities   (181)
Noncurrent liabilities   (420)
Net amount recognized at December 31   $ (601)