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Segment Reporting (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Activities by Segment [Abstract]          
Revenues $ 293,163 $ 600,558 $ 543,694 $ 1,156,131  
Depreciation depletion and amortization 4,756 6,030 9,871 12,118  
Segment Operating Earnings [Abstract]          
General and administrative (1,938) (2,318) (4,138) (5,649)  
Operating earnings 5,601 6,921 7,940 11,838  
Interest income 96 95 199 173  
Interest expense 0 0 0 (4)  
Earnings before income taxes and equity investments 5,697 7,016 8,139 12,007  
Identifiable Assets By Segment [Abstract]          
Assets 251,526   251,526   $ 243,215
Reportable Segments [Member]          
Activities by Segment [Abstract]          
Revenues 293,163 600,558 543,694 1,156,131  
Segment operating earnings 7,539 9,239 12,078 17,487  
Depreciation depletion and amortization 4,756 6,030 9,871 12,118  
Property and equipment additions 602 1,168 4,812 4,833  
Segment Operating Earnings [Abstract]          
Segment operating earnings 7,539 9,239 12,078 17,487  
General and administrative (1,938) (2,318) (4,138) (5,649)  
Operating earnings 5,601 6,921 7,940 11,838  
Interest income 96 95 199 173  
Interest expense 0 0 0 (4)  
Earnings before income taxes and equity investments 5,697 7,016 8,139 12,007  
Identifiable Assets By Segment [Abstract]          
Assets 251,526   251,526   243,215
Reportable Segments [Member] | Marketing [Member]          
Activities by Segment [Abstract]          
Revenues 278,529 581,237 514,923 1,118,985  
Segment operating earnings 7,235 9,842 11,883 18,690  
Depreciation depletion and amortization 2,514 2,787 5,203 5,554  
Property and equipment additions 251 278 514 2,128  
Segment Operating Earnings [Abstract]          
Segment operating earnings 7,235 9,842 11,883 18,690  
Identifiable Assets By Segment [Abstract]          
Assets 105,483   105,483   96,723
Reportable Segments [Member] | Transportation [Member]          
Activities by Segment [Abstract]          
Revenues 13,860 17,708 27,207 34,173  
Segment operating earnings 701 1,169 874 2,294  
Depreciation depletion and amortization 1,850 1,900 3,835 3,799  
Property and equipment additions 334 368 4,151 534  
Segment Operating Earnings [Abstract]          
Segment operating earnings 701 1,169 874 2,294  
Identifiable Assets By Segment [Abstract]          
Assets 34,731   34,731   35,010
Reportable Segments [Member] | Oil and Gas [Member]          
Activities by Segment [Abstract]          
Revenues 774 1,613 1,564 2,973  
Segment operating earnings (397) (1,772) (679) (3,497)  
Depreciation depletion and amortization 392 1,343 833 2,765  
Property and equipment additions 17 522 147 2,171  
Segment Operating Earnings [Abstract]          
Segment operating earnings (397) $ (1,772) (679) $ (3,497)  
Identifiable Assets By Segment [Abstract]          
Assets 7,666   7,666   8,930
Reportable Segments [Member] | Other [Member]          
Identifiable Assets By Segment [Abstract]          
Assets $ 103,646   $ 103,646   $ 102,552