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Note 16 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues, Total |  | $ 272,268 | [1] | $ 243,303 | $ 196,318 | $ 173,566 | $ 203,306 | [1] | $ 178,631 | $ 164,326 | $ 158,744 |  |  |
Operating income |  | 22,315 | [1] | $ 16,181 | $ 14,065 | $ 6,425 | 14,843 | [1] | $ 9,041 | $ 3,962 | $ 309 | $ 58,986 | $ 28,155 | $ 32,447
Total assets |  | 773,524 |  |  |  |  | 649,668 |  |  |  |  | 773,524 | 649,668 |
Operating Segments [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  | 727,046 | 612,834 | 601,226
Operating income |  |  |  |  |  |  |  |  |  |  |  | 45,392 | 19,567 | 24,816
Depreciation and amortization (1) | [2] |  |  |  |  |  |  |  |  |  |  | 75,446 | 76,423 | 72,434
Total assets |  | 699,266 |  |  |  |  | 607,189 |  |  |  |  | 699,266 | 607,189 | 589,249
Capital expenditures, net | [3] |  |  |  |  |  |  |  |  |  |  | (12,864) | 71,196 | 59,009
Operating Segments [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  | 165,707 | 98,182 | 73,602
Operating income |  |  |  |  |  |  |  |  |  |  |  | 13,594 | 8,588 | 7,631
Depreciation and amortization (1) | [2] |  |  |  |  |  |  |  |  |  |  | 710 | 24 | 22
Total assets |  | 74,258 |  |  |  |  | 42,479 |  |  |  |  | 74,258 | 42,479 | 31,289
Capital expenditures, net | [3] |  |  |  |  |  |  |  |  |  |  | (591) | 810 | 43
Operating Segments [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  | 892,753 | 711,016 | 674,828
Operating income |  |  |  |  |  |  |  |  |  |  |  | 58,986 | 28,155 | 32,447
Depreciation and amortization (1) | [2] |  |  |  |  |  |  |  |  |  |  | 76,156 | 76,447 | 72,456
Total assets |  | $ 773,524 |  |  |  |  | $ 649,668 |  |  |  |  | 773,524 | 649,668 | 620,538
Capital expenditures, net | [3] |  |  |  |  |  |  |  |  |  |  | (13,455) | 72,006 | 59,052
Intersegment Eliminations [Member] | Truckload [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intersegment Eliminations [Member] | Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  | (7,298) | (6,009) | (4,177)
Intersegment Eliminations [Member] | Corporate Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues, Total |  |  |  |  |  |  |  |  |  |  |  | $ (7,298) | $ (6,009) | $ (4,177)
[1] | Includes $40.1 million one-time benefit related to the Tax Act.
[2] | Includes gains and losses on disposition of equipment.
[3] | Includes equipment purchased under capital leases.

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets, net of gains (losses) from disposition + References No definition available. + Details
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