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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 66,307 | $ 74,932
Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 24,002 | 44,617
Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 42,305 | 30,315
Common Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 6,362 | 36,643
Fixed Income Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 17,640 | 7,974
Money Market Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,385 | 1,517
Mututal Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 40,920 | $ 28,798

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