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Segment Reporting (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Activities by Segment [Abstract]          
Revenues $ 256,877 $ 439,893 $ 800,571 $ 1,596,024  
Depreciation depletion and amortization 4,514 5,968 14,385 18,086  
Segment Operating Earnings [Abstract]          
General and administrative (2,114) (2,101) (6,252) (7,750)  
Operating earnings (loss) (1,822) (377) 6,118 11,461  
Interest income 245 64 444 237  
Interest expense 0 (1) 0 (5)  
Earnings (loss) before income taxes and equity investments (1,577) (314) 6,562 11,693  
Identifiable Assets By Segment [Abstract]          
Assets 232,911   232,911   $ 243,215
Reportable Segments [Member]          
Activities by Segment [Abstract]          
Revenues 256,877 439,893 800,571 1,596,024  
Segment operating earnings 292 1,724 12,370 19,211  
Depreciation depletion and amortization 4,514 5,968 14,385 18,086  
Property and equipment additions 2,414 1,508 7,186 6,347  
Segment Operating Earnings [Abstract]          
Segment operating earnings 292 1,724 12,370 19,211  
General and administrative (2,114) (2,101) (6,252) (7,750)  
Operating earnings (loss) (1,822) (377) 6,118 11,461  
Interest income 245 64 444 237  
Interest expense 0 (1) 0 (5)  
Earnings (loss) before income taxes and equity investments (1,577) (314) 6,562 11,693  
Identifiable Assets By Segment [Abstract]          
Assets 232,911   232,911   243,215
Reportable Segments [Member] | Marketing [Member]          
Activities by Segment [Abstract]          
Revenues 243,704 423,014 758,627 1,541,999  
Segment operating earnings 1,265 3,715 13,148 22,405  
Depreciation depletion and amortization 2,418 2,782 7,621 8,336  
Property and equipment additions 0 0 514 2,128  
Segment Operating Earnings [Abstract]          
Segment operating earnings 1,265 3,715 13,148 22,405  
Identifiable Assets By Segment [Abstract]          
Assets 98,689   98,689   96,723
Reportable Segments [Member] | Transportation [Member]          
Activities by Segment [Abstract]          
Revenues 12,310 15,748 39,517 49,921  
Segment operating earnings (430) 918 444 3,212  
Depreciation depletion and amortization 1,701 1,892 5,536 5,691  
Property and equipment additions 2,329 1,050 6,480 1,584  
Segment Operating Earnings [Abstract]          
Segment operating earnings (430) 918 444 3,212  
Identifiable Assets By Segment [Abstract]          
Assets 34,558   34,558   35,010
Reportable Segments [Member] | Oil and Gas [Member]          
Activities by Segment [Abstract]          
Revenues 863 1,131 2,427 4,104  
Segment operating earnings (543) (2,909) (1,222) (6,406)  
Depreciation depletion and amortization 395 1,294 1,228 4,059  
Property and equipment additions 85 458 192 2,635  
Segment Operating Earnings [Abstract]          
Segment operating earnings (543) $ (2,909) (1,222) $ (6,406)  
Identifiable Assets By Segment [Abstract]          
Assets 7,459   7,459   8,930
Reportable Segments [Member] | Other [Member]          
Identifiable Assets By Segment [Abstract]          
Assets $ 92,205   $ 92,205   $ 102,552