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Note 18 - Segments - Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from external customers | $ 1,208,103 | $ 1,257,459 | $ 1,203,523 | $ 1,044,797 | $ 1,021,271 | $ 1,096,041 | $ 1,026,462 | $ 1,070,840 | $ 4,713,882 | $ 4,214,614 | $ 4,979,733
Interest income |  |  |  |  |  |  |  |  | 891 | 621 | 490
Interest expense |  |  |  |  |  |  |  |  | 13,201 | 14,900 | 13,963
Depreciation and amortization |  |  |  |  |  |  |  |  | 50,069 | 51,261 | 43,859
Segment operating income | 38,017 | 48,436 | 37,407 | 24,849 | 23,387 | 27,588 | 21,572 | 8,181 | 148,709 | 80,728 | 121,276
Segment income (loss) from continuing operations before taxes | 34,423 | $ 45,335 | $ 34,583 | $ 22,058 | 20,395 | $ 24,303 | $ 17,809 | $ 3,942 | 136,399 | 66,449 | 107,803
Segment assets | 2,890,139 |  |  |  | 2,603,047 |  |  |  | 2,890,139 | 2,603,047 | 2,852,008
Goodwill | 291,391 |  |  |  | 290,191 |  |  |  | 291,391 | 290,191 | 285,041
Expenditures for segment assets |  |  |  |  |  |  |  |  | 209,917 | 196,965 | 367,790
Truck Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 4,698,035 | 4,199,348 | 4,964,642
Interest income |  |  |  |  |  |  |  |  | 891 | 621 | 490
Interest expense |  |  |  |  |  |  |  |  | 13,024 | 14,740 | 13,814
Depreciation and amortization |  |  |  |  |  |  |  |  | 49,634 | 50,771 | 43,355
Segment operating income |  |  |  |  |  |  |  |  | 149,338 | 81,483 | 122,907
Segment income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | 137,205 | 67,364 | 109,583
Segment assets | 2,855,001 |  |  |  | 2,570,016 |  |  |  | 2,855,001 | 2,570,016 | 2,818,255
Goodwill | 288,831 |  |  |  | 287,631 |  |  |  | 288,831 | 287,631 | 282,481
Expenditures for segment assets |  |  |  |  |  |  |  |  | 209,852 | 196,704 | 367,482
Other Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 15,847 | 15,266 | 15,091
Interest income |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  | 177 | 160 | 149
Depreciation and amortization |  |  |  |  |  |  |  |  | 435 | 490 | 504
Segment operating income |  |  |  |  |  |  |  |  | (629) | (756) | (1,631)
Segment income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | (806) | (915) | (1,780)
Segment assets | 35,138 |  |  |  | 33,031 |  |  |  | 35,138 | 33,031 | 33,753
Goodwill | $ 2,560 |  |  |  | $ 2,560 |  |  |  | 2,560 | 2,560 | 2,560
Expenditures for segment assets |  |  |  |  |  |  |  |  | $ 65 | $ 261 | $ 308

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