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Accounting for Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2016
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 (in thousands):
Non-trading 
Commodity
Notional

December 31, 2016

December 31, 2015
Natural Gas
MMBtu

8,016


7,543

Natural Gas Basis
MMBtu

—


455

Electricity
MWh

3,958


1,187

Trading
Commodity
Notional

December 31, 2016

December 31, 2015
Natural Gas
MMBtu

(953
)

8

Natural Gas Basis
MMBtu

(380
)

(455
)
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):

Year Ended December 31,
  
2016

2015

2014
Gain (loss) on non-trading derivatives, net
22,254


(18,423
)

(8,713
)
Gain (loss) on trading derivatives, net (including gain on trading derivatives—affiliates, net of $0, $0 and $203 for the years ended December 31, 2016, 2015 and 2014, respectively)
153


(74
)

(5,822
)
Gain (loss) on derivatives, net
$
22,407


$
(18,497
)

$
(14,535
)
Current period settlements on non-trading derivatives (1) (2)
(2,284
)

20,279


(6,289
)
Current period settlements on trading derivatives (including current period settlements on trading derivatives—affiliates, net of $0, $0 and $315 for the years ended December 31, 2016, 2015 and 2014, respectively)
138


268


2,810

Total current period settlements on derivatives (1) (2)
$
(2,146
)

$
20,547


$
(3,479
)

(1)
Excludes settlements of $1.0 million and $3.4 million, respectively, for the years ended December 31, 2016 and 2015, respectively related to non-trading derivative liabilities assumed in the acquisitions of CenStar and Oasis.
(2)
Excludes settlements of $25.6 million for the year ended December 31, 2016 related to non-trading derivative liabilities assumed in the acquisitions of Provider Companies and Major Energy Companies.
Offsetting Assets
  
December 31, 2015
Description
Gross Assets

Gross
Amounts
Offset

Net Assets

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
589


$
(389
)

$
200


$
—


$
200

Trading commodity derivatives
411


(6
)

405


—


405

Total Current Derivative Assets
1,000


(395
)

605


—


605

Non-trading commodity derivatives
—


—


—


—


—

Total Non-current Derivative Assets
—


—


—


—


—

Total Derivative Assets
$
1,000


$
(395
)

$
605


$
—


$
605

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):
 
  
December 31, 2016
Description
Gross Assets

Gross
Amounts
Offset

Net Assets

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
19,657


$
(11,844
)

$
7,813


$
—


$
7,813

Trading commodity derivatives
614


(83
)

531


—


531

Total Current Derivative Assets
20,271


(11,927
)

8,344


—


8,344

Non-trading commodity derivatives
7,874


(4,791
)

3,083


—


3,083

Total Non-current Derivative Assets
7,874


(4,791
)

3,083


—


3,083

Total Derivative Assets
$
28,145


$
(16,718
)

$
11,427


$
—


$
11,427
Offsetting Liabilities

December 31, 2016
Description
Gross 
Liabilities

Gross
Amounts
Offset

Net
Liabilities

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
(662
)

$
69


$
(593
)




$
(593
)
Trading commodity derivatives
(92
)

5


(87
)

—


(87
)
Total Current Derivative Liabilities
(754
)

74


(680
)

—


(680
)
Non-trading commodity derivatives
(305
)

237


(68
)

—


(68
)
Total Non-current Derivative Liabilities
(305
)

237


(68
)

—


(68
)
Total Derivative Liabilities
$
(1,059
)

$
311


$
(748
)

$
—


$
(748
)

December 31, 2015
Description
Gross 
Liabilities

Gross
Amounts
Offset

Net
Liabilities

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
(13,618
)

$
3,151


$
(10,467
)

$
100


$
(10,367
)
Trading commodity derivatives
(320
)

67


(253
)

—


(253
)
Total Current Derivative Liabilities
(13,938
)

3,218


(10,720
)

100


(10,620
)
Non-trading commodity derivatives
(950
)

332


(618
)

—


(618
)
Total Non-current Derivative Liabilities
(950
)

332


(618
)

—


(618
)
Total Derivative Liabilities
$
(14,888
)

$
3,550


$
(11,338
)

$
100


$
(11,238
)
Accumulated Other Comprehensive Income

December 31, 2015
Description
Gross 
Liabilities

Gross
Amounts
Offset

Net
Liabilities

Cash
Collateral
Offset

Net Amount
Presented
Non-trading commodity derivatives
$
(13,618
)

$
3,151


$
(10,467
)

$
100


$
(10,367
)
Trading commodity derivatives
(320
)

67


(253
)

—


(253
)
Total Current Derivative Liabilities
(13,938
)

3,218


(10,720
)

100


(10,620
)
Non-trading commodity derivatives
(950
)

332


(618
)

—


(618
)
Total Non-current Derivative Liabilities
(950
)

332


(618
)

—


(618
)
Total Derivative Liabilities
$
(14,888
)

$
3,550


$
(11,338
)

$
100


$
(11,238
)