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Note 18 - Segments (Details) - Segment Reporting Information (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
2013      
Revenues from external customers, by segment $ 3,384,705 $ 3,090,567 $ 2,580,611
Interest income, by segment 41 21 20
Interest expense, by segment 10,734 13,038 7,181
Depreciation and amortization, by segment 29,925 25,016 20,084
Segment income (loss) from continuing operations before taxes, by segment 81,061 101,183 90,177
Segment assets, by segment 2,167,798 1,881,566 1,717,701
Goodwill, by segment 215,464 198,257 182,612
Expenditures for segment assets, by segment 191,584 170,951 148,543
Truck Segment [Member]
      
2013      
Revenues from external customers, by segment 3,365,900 3,072,092 2,562,740
Interest income, by segment 41 21 20
Interest expense, by segment 10,559 12,830 6,876
Depreciation and amortization, by segment 29,403 24,482 19,471
Segment income (loss) from continuing operations before taxes, by segment 81,856 102,392 91,820
Segment assets, by segment 2,140,008 1,855,431 1,691,938
Goodwill, by segment 212,904 195,697 180,052
Expenditures for segment assets, by segment 191,016 170,436 148,384
Other Segments [Member]
      
2013      
Revenues from external customers, by segment 18,805 18,475 17,871
Interest expense, by segment 175 208 305
Depreciation and amortization, by segment 522 534 613
Segment income (loss) from continuing operations before taxes, by segment (795) (1,209) (1,643)
Segment assets, by segment 27,790 26,135 25,763
Goodwill, by segment 2,560 2,560 2,560
Expenditures for segment assets, by segment $ 568 $ 515 $ 159