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Segment Information (Summary Of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |
Revenues | $ 592,703 | $ 596,117
Operating Income | 31,066 | 48,019
Truckload Transportation Services |  |
Segment Reporting Information [Line Items] |  |
Revenues | 464,863 | 462,891
Operating Income | 29,089 | 42,953
Werner Logistics |  |
Segment Reporting Information [Line Items] |  |
Revenues | 112,164 | 117,370
Operating Income | 1,085 | 4,711
Other |  |
Segment Reporting Information [Line Items] |  |
Revenues | 15,068 | 15,472
Operating Income | 2,900 | 1,179
Corporate |  |
Segment Reporting Information [Line Items] |  |
Revenues | 619 | 589
Operating Income | (2,008) | (824)
Subtotal |  |
Segment Reporting Information [Line Items] |  |
Revenues | 592,714 | 596,322
Inter-segment eliminations |  |
Segment Reporting Information [Line Items] |  |
Revenues | $ (11) | $ (205)

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