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Segment Reporting - Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Segment Reporting Information [Line Items]    
Income before income tax expense $ 13,792 $ 16,729
Interest and other income 199 (95)
Interest expense 3,445 753
Operating Income 17,038 17,577
Depreciation and amortization 9,232 6,789
General and administrative [1] 24,377 17,380
Less:    
Net asset optimization (expense)/revenues [2] (194) 527
Net, Losses on non-trading derivative instruments (21,456) (9,749)
Net, Cash settlements on non-trading derivative instruments 6,178 10,457
Retail Gross Margin 64,304 39,562
Non-trading    
Less:    
Net, Losses on non-trading derivative instruments (21,037) (9,620)
Net, Cash settlements on non-trading derivative instruments $ 7,574 $ 11,277
[1] General and administrative includes general and administrative expense—affiliates of $7,300 and $4,400 for the three months ended March 31, 2017 and 2016, respectively.
[2] Net asset optimization revenues (expenses) includes asset optimization revenues —affiliates of $0 and $113 for the three months ended March 31, 2017 and 2016, respectively, and asset optimization revenues—affiliates cost of revenues of $0 and $1,258 for the three months ended March 31, 2017 and 2016, respectively.