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Accounting for Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Volumetric Underlying Derivative Transactions
The following table summarizes the net notional volume buy/(sell) of the Company’s open derivative financial instruments accounted for at fair value, broken out by commodity, as of:
Non-trading 
Commodity
Notional

September 30, 2014

December 31, 2013
Natural Gas
MMBtu

10,948


3,513

Natural Gas Basis
MMBtu

4,015


373

Electricity
MWh

602


465

Trading
Commodity
Notional

September 30, 2014

December 31, 2013
Natural Gas
MMBtu

562


2,259

Natural Gas Basis
MMBtu

—


1,443
Gains (Losses) on Derivative Instruments
Gains (losses) on derivative instruments, net and current period settlements on derivative instruments were as follows for the periods indicated (in thousands):

Three Months Ended September 30,
  
2014

2013
Loss on non-trading derivatives—cash flow hedges, net
—


(892
)
Gain (loss) on non-trading derivatives, net (including loss on non-trading derivatives—affiliates, net of $0 and $66 for the three months ended September 30, 2014 and 2013, respectively)
(1,163
)

2,679

Gain (loss) on trading derivatives, net (including loss on trading derivatives—affiliates, net of $0 and $2,191 for the three months ended September 30, 2014 and 2013, respectively)
(15
)

895

Gain (loss) on derivatives, net
$
(1,178
)

$
2,682

Current period settlements on non-trading derivatives—cash flow hedges, net
—


1,180

Current period settlements on non-trading derivatives
3,039


(1,719
)
Current period settlements on trading derivatives (including current period settlements on trading derivatives—affiliates, net of $0 and $1,651 for the three months ended September 30, 2014 and 2013, respectively)
(35
)

(527
)
Total current period settlements on derivatives
$
3,004


$
(1,066
)

Nine Months Ended September 30,
  
2014

2013
Loss on non-trading derivatives—cash flow hedges, net (including ineffectiveness loss of $288 for the nine months ended September 30, 2013)
$
—


$
(1,096
)
Gain on non-trading derivatives, net (including gain on non-trading derivatives—affiliates, net of $10 for the nine months ended September 30, 2013)
5,847


695

Gain (loss) on trading derivatives, net (including gain (loss) on trading derivatives—affiliates, net of $1,792 and ($2,462) for the nine months ended September 30, 2014 and 2013, respectively)
(5,585
)

2,441

Gain on derivatives, net
$
262


$
2,040

Current period settlements on non-trading derivatives—cash flow hedges
$
—


$
—

Current period settlements on non-trading derivatives
(9,959
)

(1,843
)
Current period settlements on trading derivatives (including current period settlements on trading derivatives—affiliates, net of $1,693 and $2,191 for the nine months ended September 30, 2014 and 2013, respectively)
2,707


(33
)
Total current period settlements on derivatives
$
(7,252
)

$
(1,876
)
Offsetting Assets
The following tables summarize the fair value and offsetting amounts of the Company’s derivative instruments by counterparty and collateral received or paid as of (in thousands):
 
  
September 30, 2014
Description
Gross Assets

Gross
Amounts
Offset

Net Assets

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
4,168


$
(3,461
)

$
707


$
—


$
707

Trading commodity derivatives
527


(334
)

193


—


193

Total Current Derivative Assets
4,695


(3,795
)

900


—


900

Non-trading commodity derivatives
123


(112
)

11


—


11

Total Non-current Derivative Assets
123


(112
)

11


—


11

Total Derivative Assets
$
4,818


$
(3,907
)

$
911


$
—


$
911

  
December 31, 2013
Description
Gross Assets

Gross
Amounts
Offset

Net Assets

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
11,564


$
(6,898
)

$
4,666


$
—


$
4,666

Trading commodity derivatives
3,949


(544
)

3,405


—


3,405

Total Current Derivative Assets
15,513


(7,442
)

8,071


—


8,071

Non-trading commodity derivatives
100


(94
)

6


—


6

Trading commodity derivatives
14


(14
)

—


—


—

Total Non-current Derivative Assets
114


(108
)

6


—


6

Total Derivative Assets
$
15,627


$
(7,550
)

$
8,077


$
—


$
8,077
Offsetting Liabilities

September 30, 2014
Description
Gross 
Liabilities

Gross
Amounts
Offset

Net
Liabilities

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
(5,102
)

$
3,461


$
(1,641
)

$
139


$
(1,502
)
Trading commodity derivatives
(433
)

334


(99
)

—


(99
)
Total Current Derivative Liabilities
(5,535
)

3,795


(1,740
)

139


(1,601
)
Non-trading commodity derivatives
(186
)

112


(74
)

—


(74
)
Total Non-current Derivative Liabilities
(186
)

112


(74
)

—


(74
)
Total Derivative Liabilities
$
(5,721
)

$
3,907


$
(1,814
)

$
139


$
(1,675
)

December 31, 2013
Description
Gross Liabilities

Gross
Amounts
Offset

Net
Liabilities

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
(8,289
)

$
6,898


$
(1,391
)

$
—


$
(1,391
)
Trading commodity derivatives
(986
)

544


(442
)

—


(442
)
Total Current Derivative Assets
(9,275
)

7,442


(1,833
)

—


(1,833
)
Non-trading commodity derivatives
(120
)

94


(26
)

—


(26
)
Trading commodity derivatives
(6
)

14


8


—


8

Total Non-current Derivative Assets
(126
)

108


(18
)

—


(18
)
Total Derivative Liabilities
$
(9,401
)

$
7,550


$
(1,851
)

$
—


$
(1,851
)
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the effects on the Company’s accumulated OCI balance attributable to cash flow hedge derivative instruments for the periods indicated (in thousands): 
  
Three Months Ended September 30,
 
Nine Months Ended September 30,
  
2014
 
2013
 
2014
 
2013
Accumulated OCI balance, beginning of period
$
—

 
$
—

 
$
—

 
$
(2,536
)
Deferred gain (loss) on cash flow hedge derivative instruments
—

 
—

 
—

 
2,620

Reclassification of accumulated OCI net to income
—

 
—

 
—

 
(84
)
Accumulated OCI balance, end of period
$
—

 
$
—

 
$
—

 
$
—