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Note 19 - Business Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Total revenue $ 1,065,189 $ 1,112,114 $ 2,616,887 $ 2,560,019  
Gross profit 125,997 122,558 238,139 170,454  
Assets, Total 2,488,273 2,612,660 2,488,273 2,612,660 $ 2,502,088
Transportation [Member]          
Total revenue 623,999 623,867 1,510,001 1,407,577  
Gross profit 54,322 46,865 110,888 31,016  
Depreciation, depletion and amortization 5,268 4,096 14,685 12,581  
Water [Member]          
Total revenue 106,599 134,404 317,980 345,556  
Gross profit 12,557 12,637 34,483 31,085  
Depreciation, depletion and amortization 8,258 9,272 27,399 31,259  
Specialty [Member]          
Total revenue 205,134 224,744 513,087 538,497  
Gross profit 33,292 38,586 47,853 73,639  
Depreciation, depletion and amortization 5,046 7,747 18,166 21,960  
Materials [Member]          
Total revenue 129,457 129,099 275,819 268,389  
Gross profit 25,826 24,470 44,915 34,714  
Depreciation, depletion and amortization 6,120 6,784 16,563 18,417  
Operating Segments [Member]          
Total revenue 1,130,030 1,181,553 2,741,876 2,694,067  
Gross profit 125,997 122,558 238,139 170,454  
Depreciation, depletion and amortization 24,692 27,899 76,813 84,217  
Assets, Total 929,225 1,115,334 929,225 1,115,334  
Operating Segments [Member] | Transportation [Member]          
Total revenue 623,999 623,867 1,510,001 1,407,577  
Assets, Total 305,962 314,247 305,962 314,247  
Operating Segments [Member] | Water [Member]          
Total revenue 106,599 134,404 317,980 345,556  
Assets, Total 142,604 293,156 142,604 293,156  
Operating Segments [Member] | Specialty [Member]          
Total revenue 205,134 224,744 513,087 538,497  
Assets, Total 118,797 136,466 118,797 136,466  
Operating Segments [Member] | Materials [Member]          
Total revenue 194,298 198,538 400,808 402,437  
Assets, Total 361,862 371,465 361,862 371,465  
Consolidation, Eliminations [Member]          
Total revenue (64,841) (69,439) (124,989) (134,048)  
Consolidation, Eliminations [Member] | Transportation [Member]          
Total revenue 0 0 0 0  
Consolidation, Eliminations [Member] | Water [Member]          
Total revenue 0 0 0 0  
Consolidation, Eliminations [Member] | Specialty [Member]          
Total revenue 0 0 0 0  
Consolidation, Eliminations [Member] | Materials [Member]          
Total revenue $ (64,841) $ (69,439) $ (124,989) $ (134,048)