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Segment Reporting (Tables)
12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Reconciliation of Retail Gross Margin to (Loss) Income Before Income Tax Expense
Below is a reconciliation of retail gross margin to income before income tax expense (in thousands). 
  
 
Years Ended December 31,
(in thousands)
 
2016
 
2015
 
2014
Reconciliation of Retail Gross Margin to Income before taxes
 





Income before income tax expense
 
$
76,099


$
27,949


$
(5,156
)
Interest and other income
 
(957
)

(324
)

(263
)
Interest expense
 
8,859


2,280


1,578

Operating Income
 
84,001


29,905


(3,841
)
Depreciation and amortization
 
32,788


25,378


22,221

General and administrative
 
84,964


61,682


45,880

Less:
 
 




Net asset optimization (expenses) revenue
 
(586
)

1,494


2,318

Net, Gain (losses) on non-trading derivative instruments
 
22,254


(18,423
)

(8,713
)
Net, Cash settlements on non-trading derivative instruments
 
(2,284
)

20,279


(6,289
)
Retail Gross Margin
 
$
182,369


$
113,615


$
76,944

Schedule of Financial Data for Business Segments
Financial data for business segments are as follows (in thousands):
Year Ended December 31, 2016
Retail
Electricity

Retail
Natural Gas

Corporate
and Other

Eliminations

Spark Retail
Total Revenues
$
417,229


$
129,468


$


$


$
546,697

Retail cost of revenues
286,795


58,149






344,944

Less:









Net asset optimization revenues


(586
)





(586
)
Net, Gains (losses) on non-trading derivative instruments
17,187


5,067






22,254

Current period settlements on non-trading derivatives
(4,889
)

2,605






(2,284
)
Retail gross margin
$
118,136


$
64,233


$


$


$
182,369

Total Assets 
$
577,695


$
242,739


$
169,404


$
(613,670
)

$
376,168

Goodwill
$
76,617

 
$
2,530

 
$

 
$

 
$
79,147

Year Ended December 31, 2015
Retail
Electricity

Retail
Natural Gas

Corporate
and Other

Eliminations

Spark Retail
Total Revenues
$
229,490


$
128,663


$


$


$
358,153

Retail cost of revenues
170,684


70,504






241,188

Less:









Net asset optimization revenues


1,494






1,494

Net, Gains (losses) on non-trading derivative instruments
(13,348
)

(5,075
)





(18,423
)
Current period settlements on non-trading derivatives
11,899


8,380






20,279

Retail gross margin
$
60,255


$
53,360


$


$


$
113,615

Total Assets
$
150,245


$
113,583


$
88,823


$
(190,417
)

$
162,234

Goodwill
$
16,476

 
$
1,903

 
$

 
$

 
$
18,379

Year Ended December 31, 2014
Retail
Electricity

Retail
Natural Gas

Corporate
and Other

Eliminations

Spark Retail
Total Revenues
$
176,406


$
146,470


$


$


$
322,876

Retail cost of revenues
149,452


109,164






258,616

Less:










Net asset optimization revenues


2,318






2,318

Net, Gains (losses) on non-trading derivative instruments
(518
)

(8,195
)





(8,713
)
Current period settlements on non-trading derivatives
(5,145
)

(1,144
)





(6,289
)
Retail gross margin
$
32,617


$
44,327


$


$


$
76,944

Total Assets
$
46,848

 
$
101,711

 
$
27,285

 
$
(37,447
)
 
$
138,397