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Employee Benefit Plans (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | $ 267 |
Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets | 38,903 | 41,306
Significant Unobservable Inputs (Level 3) [Member] |  |
Fair value of plan assets |  |
Fair Value Total [Member] |  |
Fair value of plan assets | 39,170 | 41,306
Cash and cash equivalents (money market fund) [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets | 267 |
Cash and cash equivalents (money market fund) [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets |  | 41,306
Cash and cash equivalents (money market fund) [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair value of plan assets |  |
Cash and cash equivalents (money market fund) [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | 267 | $ 41,306
Investment funds - Fixed income funds [Member] | Quoted Prices in Market for Identical Assets (Level 1) [Member] |  |
Fair value of plan assets |  |
Investment funds - Fixed income funds [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value of plan assets | 38,903 |
Investment funds - Fixed income funds [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair value of plan assets |  |
Investment funds - Fixed income funds [Member] | Fair Value Total [Member] |  |
Fair value of plan assets | $ 38,903 |

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