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Note 17 - Segments - Segment Reporting 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 from external customers | $ 1,540,442 | $ 1,376,136 | $ 1,348,831 | $ 1,240,781 | $ 1,208,103 | $ 1,257,459 | $ 1,203,523 | $ 1,044,797 | $ 5,506,190 | $ 4,713,882 | $ 4,214,614
Interest income |  |  |  |  |  |  |  |  | 1,376 | 891 | 621
Interest expense |  |  |  |  |  |  |  |  | 21,058 | 13,201 | 14,900
Depreciation and amortization |  |  |  |  |  |  |  |  | 70,489 | 50,069 | 51,261
Segment operating income | 68,387 | 58,649 | 43,426 | 32,389 | 38,017 | 48,436 | 37,407 | 24,849 | 202,851 | 148,709 | 80,728
Segment income (loss) from continuing operations before taxes | 61,973 | $ 54,181 | $ 38,932 | $ 28,083 | 34,423 | $ 45,335 | $ 34,583 | $ 22,058 | 183,169 | 136,399 | 66,449
Segment assets | 3,201,350 |  |  |  | 2,890,139 |  |  |  | 3,201,350 | 2,890,139 | 2,603,047
Goodwill | 291,391 |  |  |  | 291,391 |  |  |  | 291,391 | 291,391 | 290,191
Expenditures for segment assets |  |  |  |  |  |  |  |  | 238,260 | 209,917 | 196,965
Truck Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 5,488,787 | 4,698,035 | 4,199,348
Interest income |  |  |  |  |  |  |  |  | 1,376 | 891 | 621
Interest expense |  |  |  |  |  |  |  |  | 20,850 | 13,024 | 14,740
Depreciation and amortization |  |  |  |  |  |  |  |  | 70,170 | 49,634 | 50,771
Segment operating income |  |  |  |  |  |  |  |  | 202,725 | 149,338 | 81,483
Segment income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | 183,251 | 137,205 | 67,364
Segment assets | 3,166,174 |  |  |  | 2,855,001 |  |  |  | 3,166,174 | 2,855,001 | 2,570,016
Goodwill | 288,831 |  |  |  | 288,831 |  |  |  | 288,831 | 288,831 | 287,631
Expenditures for segment assets |  |  |  |  |  |  |  |  | 238,229 | 209,852 | 196,704
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 17,403 | 15,847 | 15,266
Interest income |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 208 | 177 | 160
Depreciation and amortization |  |  |  |  |  |  |  |  | 319 | 435 | 490
Segment operating income |  |  |  |  |  |  |  |  | 126 | (629) | (756)
Segment income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | (82) | (806) | (915)
Segment assets | 35,176 |  |  |  | 35,138 |  |  |  | 35,176 | 35,138 | 33,031
Goodwill | $ 2,560 |  |  |  | $ 2,560 |  |  |  | 2,560 | 2,560 | 2,560
Expenditures for segment assets |  |  |  |  |  |  |  |  | $ 31 | $ 65 | $ 261

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