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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets $ 46,784 $ 42,749 $ 48,556
Fixed Income Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 18,720 18,210  
Large cap stock fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 15,546 12,671  
Small cap stock fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 3,567 3,562  
International fund [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 6,369 5,799  
Real Estate Funds [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 2,339 2,195  
Cash and Cash Equivalents [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 243 312  
Fair Value, Inputs, Level 1 [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension Plan Assets 46,784 42,749  
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 18,720 18,210  
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 15,546 12,671  
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 3,567 3,562  
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 6,369 5,799  
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 2,339 2,195  
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 $ 243 $ 312