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Employee Benefit Plans (Schedule of Changes in Fair Value of Plan Assets) (Details) - Pension Benefits [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets $ 48,314 $ 46,784 $ 42,749
Fixed Income Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 16,670 18,720  
Large cap stock fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 16,033 15,546  
Small cap stock fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 4,558 3,567  
International fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 6,338 6,369  
Real Estate Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 4,576 2,339  
Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 139 243  
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 48,314 46,784  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 16,670 18,720  
Fair Value, Inputs, Level 1 [Member] | Large cap stock fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 16,033 15,546  
Fair Value, Inputs, Level 1 [Member] | Small cap stock fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 4,558 3,567  
Fair Value, Inputs, Level 1 [Member] | International fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 6,338 6,369  
Fair Value, Inputs, Level 1 [Member] | Real Estate Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 4,576 2,339  
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets $ 139 $ 243