XML 23 R18.htm IDEA: XBRL DOCUMENT v3.3.0.814
Segment Reporting (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Activities by Segment [Abstract]          
Revenues $ 439,893 $ 1,173,970 $ 1,596,024 $ 3,283,090  
Depreciation depletion and amortization 5,968 6,228 18,086 18,443  
Segment Operating Earnings [Abstract]          
General and administrative (2,101) (2,300) (7,750) (6,701)  
Operating earnings (loss) (377) 5,732 11,461 20,220  
Interest income 64 118 237 205  
Interest expense (1) (2) (5) (2)  
Earnings (loss) before income taxes (314) 5,848 11,693 20,423  
Identifiable Assets By Segment [Abstract]          
Assets 288,801   288,801   $ 340,814
Operating Segments [Member]          
Activities by Segment [Abstract]          
Revenues 439,893 1,173,970 1,596,024 3,283,090  
Segment operating earnings 1,724 8,032 19,211 26,921  
Depreciation depletion and amortization 5,968 6,228 18,086 18,443  
Property and equipment additions 1,508 10,566 6,347 22,655  
Segment Operating Earnings [Abstract]          
Segment operating earnings 1,724 8,032 19,211 26,921  
General and administrative (2,101) (2,300) (7,750) (6,701)  
Operating earnings (loss) (377) 5,732 11,461 20,220  
Interest income 64 118 237 205  
Interest expense (1) (2) (5) (2)  
Earnings (loss) before income taxes (314) 5,848 11,693 20,423  
Identifiable Assets By Segment [Abstract]          
Assets 288,801   288,801   340,814
Operating Segments [Member] | Marketing [Member]          
Activities by Segment [Abstract]          
Revenues 423,014 1,153,249 1,541,999 3,219,457  
Segment operating earnings 3,715 5,041 22,405 22,187  
Depreciation depletion and amortization 2,782 2,450 8,336 7,006  
Property and equipment additions 0 3,377 2,128 9,308  
Segment Operating Earnings [Abstract]          
Segment operating earnings 3,715 5,041 22,405 22,187  
Identifiable Assets By Segment [Abstract]          
Assets 132,721   132,721   189,332
Operating Segments [Member] | Transportation [Member]          
Activities by Segment [Abstract]          
Revenues 15,748 17,538 49,921 52,490  
Segment operating earnings 918 1,464 3,212 3,594  
Depreciation depletion and amortization 1,892 1,882 5,691 5,513  
Property and equipment additions 1,050 5,851 1,584 6,280  
Segment Operating Earnings [Abstract]          
Segment operating earnings 918 1,464 3,212 3,594  
Identifiable Assets By Segment [Abstract]          
Assets 32,351   32,351   37,643
Operating Segments [Member] | Oil and Gas [Member]          
Activities by Segment [Abstract]          
Revenues 1,131 3,183 4,104 11,143  
Segment operating earnings (2,909) 1,527 (6,406) 1,140  
Depreciation depletion and amortization 1,294 1,896 4,059 5,924  
Property and equipment additions 458 1,338 2,635 7,067  
Segment Operating Earnings [Abstract]          
Segment operating earnings (2,909) $ 1,527 (6,406) $ 1,140  
Identifiable Assets By Segment [Abstract]          
Assets 20,921   20,921   25,888
Operating Segments [Member] | Other [Member]          
Identifiable Assets By Segment [Abstract]          
Assets $ 102,808   $ 102,808   $ 87,951