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ORGANIZATION AND DESCRIPTION OF THE BUSINESS AND FINANCIAL STATEMENT PRESENTATION (ASC Topic 606) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
ASC Topic 606 |  |  |  |  |  |
Retained earnings | $ 449,442 |  | $ 449,442 |  |  | $ 438,379
Revenues | 793,350 | $ 720,368 | 1,493,351 | $ 1,371,456 |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC Topic 606, Revenue from Contracts with Customers |  |  |  |  |  |
ASC Topic 606 |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 400 |
Revenues | 1,100 |  | 800 |  |  |
Purchased transportation | $ 800 |  | $ 500 |  |  |

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