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Segment Reporting (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Activities by Segment [Abstract]                      
Revenues $ 298,969 $ 256,877 $ 293,163 $ 250,531 $ 348,255 $ 439,893 $ 600,558 $ 555,573 $ 1,099,540 $ 1,944,279 $ 4,132,826
Segment operating earnings (loss)                 16,464 7,580 18,094
Depreciation, depletion and amortization                 18,792 23,717 24,615
Segment Operating Earnings [Abstract]                      
Segment operating earnings                 16,464 7,580 18,094
General and administrative expenses                 (10,410) (9,939) (8,613)
Operating (Loss) Earnings                 6,054 (2,359) 9,481
Interest income                 582 327 301
Interest expense                 (2) (13) (2)
Earnings (loss) before income taxes and equity investments                 6,634 (2,045) 9,780
Identifiable Assets By Segment [Abstract]                      
Assets 246,872       243,215       246,872 243,215  
Reportable Segments [Member]                      
Activities by Segment [Abstract]                      
Revenues                 1,099,540 1,944,279 4,132,826
Segment operating earnings (loss)                 16,464 7,580 18,094
Depreciation, depletion and amortization                 18,792 23,717 24,615
Property and equipment additions                 8,484 11,074 30,523
Segment Operating Earnings [Abstract]                      
Segment operating earnings                 16,464 7,580 18,094
Identifiable Assets By Segment [Abstract]                      
Assets 246,872       243,215       246,872 243,215 340,814
Marketing [Member]                      
Activities by Segment [Abstract]                      
Inventory liquidation and valuation (gain) losses         5,400         5,400 14,300
Marketing [Member] | Reportable Segments [Member]                      
Activities by Segment [Abstract]                      
Revenues                 1,043,775 1,875,885 4,050,497
Segment operating earnings (loss)                 17,045 22,895 [1] 20,854 [1]
Depreciation, depletion and amortization                 9,997 11,097 9,626
Property and equipment additions                 1,321 2,126 13,598
Segment Operating Earnings [Abstract]                      
Segment operating earnings                 17,045 22,895 [1] 20,854 [1]
Identifiable Assets By Segment [Abstract]                      
Assets 107,257       96,723       107,257 96,723 189,332
Transportation [Member] | Reportable Segments [Member]                      
Activities by Segment [Abstract]                      
Revenues                 52,355 63,331 68,968
Segment operating earnings (loss)                 (48) 3,701 4,750
Depreciation, depletion and amortization                 7,249 7,554 7,416
Property and equipment additions                 6,868 6,579 8,994
Segment Operating Earnings [Abstract]                      
Segment operating earnings                 (48) 3,701 4,750
Identifiable Assets By Segment [Abstract]                      
Assets 32,120       35,010       32,120 35,010 37,643
Oil and Gas [Member]                      
Activities by Segment [Abstract]                      
Gain on property sale                     2,500
Property impairments                   12,100 8,000
Oil and Gas [Member] | Reportable Segments [Member]                      
Activities by Segment [Abstract]                      
Revenues                 3,410 5,063 13,361
Segment operating earnings (loss) [2]                 (533) (19,016) (7,510)
Depreciation, depletion and amortization                 1,546 5,066 7,573
Property and equipment additions                 295 2,369 7,931
Segment Operating Earnings [Abstract]                      
Segment operating earnings [2]                 (533) (19,016) (7,510)
Identifiable Assets By Segment [Abstract]                      
Assets 7,279       8,930       7,279 8,930 25,888
Cash and other [Member] | Reportable Segments [Member]                      
Identifiable Assets By Segment [Abstract]                      
Assets $ 100,216       $ 102,552       $ 100,216 $ 102,552 $ 87,951
[1] Marketing segment operating earnings included inventory valuation losses totaling $5.4 million and $14.3 million for 2015 and 2014, respectively.
[2] Oil and gas segment operating earnings include gains on property sales totaling $2.5 million during 2014 and property impairments totaling $12.1 million and $8.0 million for 2015 and 2014, respectively.