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Segment Reporting (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Activities by Segment [Abstract]          
Revenues $ 600,558 $ 1,159,931 $ 1,156,131 $ 2,109,120  
Depreciation Depletion and Amortization 6,030 6,109 12,118 12,215  
Segment Operating Earnings [Abstract]          
General and administrative (2,318) (2,147) (5,649) (4,401)  
Operating earnings 6,921 6,076 11,838 14,488  
Interest income 95 45 173 87  
Interest expense 0 0 (4) 0  
Earnings before income taxes 7,016 6,121 12,007 14,575  
Identifiable Assets By Segment [Abstract]          
Assets 339,572   339,572   $ 340,814
Operating Segments [Member]          
Activities by Segment [Abstract]          
Revenues 600,558 1,159,931 1,156,131 2,109,120  
Segment operating earnings (loss) 9,239 8,223 17,487 18,889  
Depreciation Depletion and Amortization 6,030 6,109 12,118 12,215  
Property and Equipment Additions 1,168 4,319 4,833 12,089  
Segment Operating Earnings [Abstract]          
Segment operating earnings 9,239 8,223 17,487 18,889  
General and administrative (2,318) (2,147) (5,649) (4,401)  
Operating earnings 6,921 6,076 11,838 14,488  
Interest income 95 45 173 87  
Interest expense 0 0 (4) 0  
Earnings before income taxes 7,016 6,121 12,007 14,575  
Identifiable Assets By Segment [Abstract]          
Assets 339,572   339,572   340,814
Marketing [Member] | Operating Segments [Member]          
Activities by Segment [Abstract]          
Revenues 581,237 1,139,004 1,118,985 2,066,208  
Segment operating earnings (loss) 9,842 7,776 18,690 17,146  
Depreciation Depletion and Amortization 2,787 2,287 5,554 4,556  
Property and Equipment Additions 278 1,855 2,128 5,931  
Segment Operating Earnings [Abstract]          
Segment operating earnings 9,842 7,776 18,690 17,146  
Identifiable Assets By Segment [Abstract]          
Assets 190,014   190,014   189,332
Transportation [Member] | Operating Segments [Member]          
Activities by Segment [Abstract]          
Revenues 17,708 17,303 34,173 34,952  
Segment operating earnings (loss) 1,169 955 2,294 2,130  
Depreciation Depletion and Amortization 1,900 1,818 3,799 3,631  
Property and Equipment Additions 368 226 534 429  
Segment Operating Earnings [Abstract]          
Segment operating earnings 1,169 955 2,294 2,130  
Identifiable Assets By Segment [Abstract]          
Assets 34,361   34,361   37,643
Oil and Gas [Member] | Operating Segments [Member]          
Activities by Segment [Abstract]          
Revenues 1,613 3,624 2,973 7,960  
Segment operating earnings (loss) (1,772) (508) (3,497) (387)  
Depreciation Depletion and Amortization 1,343 2,004 2,765 4,028  
Property and Equipment Additions 522 2,238 2,171 5,729  
Segment Operating Earnings [Abstract]          
Segment operating earnings (1,772) $ (508) (3,497) $ (387)  
Identifiable Assets By Segment [Abstract]          
Assets 23,443   23,443   25,888
Other [Member] | Operating Segments [Member]          
Identifiable Assets By Segment [Abstract]          
Assets $ 91,754   $ 91,754   $ 87,951