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Segment Reporting (Tables)
3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Reconciliation of Operating Profit (Loss) from Segments to Consolidated
Below is a reconciliation of retail gross margin to income before income tax expense (in thousands):

  
Three Months Ended March 31,
  
2017

2016
Reconciliation of Retail Gross Margin to Income before taxes



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
24,377


17,380

Less:



Net asset optimization (expenses) revenues
(194
)

527

Net, Losses on non-trading derivative instruments
(21,037
)

(9,620
)
Net, Cash settlements on non-trading derivative instruments
7,574


11,277

Retail Gross Margin
$
64,304


$
39,562

Schedule of Segment Reporting Information, by Segment
Financial data for business segments are as follows (in thousands): 
Three Months Ended March 31, 2017
Retail
Electricity

Retail
Natural Gas

Corporate
and Other

Eliminations

Spark Retail
Total Revenues
$
131,733

 
$
62,612

 
$

 
$

 
$
194,345

Retail cost of revenues
106,780

 
36,918

 

 

 
143,698

Less:
 
 
 
 
 
 
 
 
 
Net asset optimization expenses

 
(194
)
 

 

 
(194
)
Losses on non-trading derivatives
(19,287
)
 
(1,750
)
 

 

 
(21,037
)
Current period settlements on non-trading derivatives
7,764

 
(190
)
 

 

 
7,574

Retail Gross Margin
$
36,476

 
$
27,828

 
$

 
$

 
$
64,304

Total Assets at March 31, 2017
$
666,742


$
272,045


$
163,806


$
(736,776
)

$
365,817

Goodwill at March 31, 2017
$
76,877


$
2,530


$


$


$
79,407


Three Months Ended March 31, 2016
Retail
Electricity
 
Retail
Natural Gas
 
Corporate
and Other
 
Eliminations
 
Spark Retail
Total revenues
$
61,933

 
$
48,613

 
$

 
$

 
$
110,546

Retail cost of revenues
46,300

 
22,500

 

 

 
68,800

Less:

 

 

 

 

Net asset optimization revenues

 
527

 

 

 
527

Losses on non-trading derivatives
(9,390
)
 
(230
)
 

 

 
(9,620
)
Current period settlements on non-trading derivatives
9,617

 
1,660

 

 

 
11,277

Retail Gross Margin
$
15,406

 
$
24,156

 
$

 
$

 
$
39,562

Total Assets at December 31, 2016
$
577,695


$
242,739


$
169,404


$
(613,670
)

$
376,168

Goodwill at December 31, 2016
$
76,617


$
2,530


$


$


$
79,147

Three Months Ended March 31, 2017
Retail
Electricity

Retail
Natural Gas

Corporate
and Other

Eliminations

Spark Retail
Total revenues




$


$


$


$

Retail cost of revenues











Less:









Net asset optimization expenses










(Losses) gains on non-trading derivatives



2,519






2,519

Current period settlements on non-trading derivatives



3,341






3,341

Retail Gross Margin
$


$
(5,860
)

$


$


$
(5,860
)
Total Assets at March 31, 2017
$
666,742


$
272,045


$
163,806


$
(736,776
)

$
365,817

Goodwill at March 31, 2017
$
76,877


$
2,530


$


$


$
79,407

Three Months Ended March 31, 2016
Retail
Electricity

Retail
Natural Gas

Corporate
and Other

Eliminations

Spark Retail
Total revenues




$


$


$


$

Retail cost of revenues











Less:









Net asset optimization revenues










(Losses) gains on non-trading derivatives



(5,876
)





(5,876
)
Current period settlements on non-trading derivatives



12,643






12,643

Retail Gross Margin
$


$
(6,767
)

$


$


$
(6,767
)
Total Assets at December 31, 2016




$
376,168










$
376,168

Goodwill at December 31, 2016




$
79,147


$


$


$
79,147