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Segment Information (Summary Of Segment Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 518,832 | $ 508,676 | $ 498,681 | $ 482,802 | $ 528,783 | $ 534,448 | $ 534,644 | $ 495,654 | $ 2,008,991 | $ 2,093,529 | $ 2,139,289
Operating income | $ 34,956 | $ 29,074 | $ 29,553 | $ 32,487 | $ 57,261 | $ 52,800 | $ 52,210 | $ 38,185 | 126,070 | 200,456 | 160,088
Truckload Transportation Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,533,981 | 1,644,874 | 1,702,137
Operating income |  |  |  |  |  |  |  |  | 107,713 | 189,850 | 152,992
Werner Logistics |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 417,172 | 393,174 | 390,645
Operating income |  |  |  |  |  |  |  |  | 20,734 | 16,898 | 7,535
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 57,062 | 54,512 | 46,588
Operating income |  |  |  |  |  |  |  |  | (6,177) | (7,513) | (3,991)
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,749 | 2,297 | 2,803
Operating income |  |  |  |  |  |  |  |  | 3,800 | 1,221 | 3,552
Subtotal |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,009,964 | 2,094,857 | 2,142,173
Inter-segment eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ (973) | $ (1,328) | $ (2,884)

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