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Revenue (Disaggregation of Revenue by Revenue Source) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of revenue |  |
Revenues | $ 592,703 | $ 596,117
Truckload Transportation Services |  |
Disaggregation of revenue |  |
Revenues | 464,863 | 462,891
Werner Logistics |  |
Disaggregation of revenue |  |
Revenues | 112,164 | 117,370
Inter-segment eliminations |  |
Disaggregation of revenue |  |
Revenues | (11) | (205)
Transportation Services |  |
Disaggregation of revenue |  |
Revenues | 577,016 | 580,056
Other revenues |  |
Disaggregation of revenue |  |
Revenues | $ 15,687 | $ 16,061

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