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Employee Benefit Plans (Amounts Recognized in the Balance Sheets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Noncurrent liabilities $ (5,841) $ (5,763)
Net amount recognized at December 31 (5,841) (5,763)
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Current liabilities (395) (400)
Noncurrent liabilities (4,975) (5,556)
Net amount recognized at December 31 $ (5,370) $ (5,956)