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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
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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 |

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