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Accounting for Derivative Instruments (Tables) | 9 Months Ended
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Sep. 30, 2015
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, 2015 |  | December 31, 2014
Natural Gas | MMBtu |  | 10,131 |  |  | 9,690 |
Natural Gas Basis | MMBtu |  | 993 |  |  | 2,710 |
Electricity | MWh |  | 1,368 |  |  | 607 |
Trading
Commodity | Notional |  | September 30, 2015 |  | December 31, 2014
Natural Gas | MMBtu |  | (160 | ) |  | (155 | )
Natural Gas Basis | MMBtu |  | (760 | ) |  | (56 | )
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,
| 2015 |  | 2014
Loss on non-trading derivatives, net (including loss on non-trading derivatives—affiliates, net of $0 and $0 for the three months ended September 30, 2015 and 2014, respectively) | $ | 132 |  |  | $ | (1,163 | )
Gain (loss) on trading derivatives, net (including loss on trading derivatives—affiliates, net of $0 and $0 for the three months ended September 30, 2015 and 2014, respectively) | (71 | ) |  | (15 | )
Loss on derivatives, net | 61 |  |  | (1,178 | )
Current period settlements on non-trading derivatives (1) | 4,035 |  |  | 3,039 |
Current period settlements on trading derivatives (including current period settlements on trading derivatives—affiliates, net of $0 and $0 for the three months ended September 30, 2015 and 2014, respectively) | 128 |  |  | (35 | )
Total current period settlements on derivatives | $ | 4,163 |  |  | $ | 3,004 |
(1) Excludes settlements of $2.0 million for the three months ended September 30, 2015 related to non-trading derivative liabilities assumed in the acquisitions of CenStar and Oasis.
| Nine Months Ended September 30,
| 2015 |  | 2014
Gain (loss) on non-trading derivatives, net | $ | (5,876 | ) |  | $ | 5,847 |
Loss on trading derivatives, net (including loss on trading derivatives—affiliates, net of $0 and $1,792 for the nine months ended September 30, 2015 and 2014, respectively) | (242 | ) |  | (5,585 | )
Gain (loss) on derivatives, net | (6,118 | ) |  | 262 |
Current period settlements on non-trading derivatives (1) | 12,643 |  |  | (9,959 | )
Current period settlements on trading derivatives (including current period settlements on trading derivatives—affiliates, net of $0 and $1,693 for the nine months ended September 30, 2015 and 2014, respectively) | 244 |  |  | 2,707 |
Total current period settlements on derivatives | $ | 12,887 |  |  | $ | (7,252 | )
(1) Excludes settlements of $2.2 million for the nine months ended September 30, 2015 related to non-trading derivative liabilities assumed in the acquisitions of CenStar and Oasis.
Offsetting Assets |
| December 31, 2014
Description | Gross Assets |  | Gross Amounts Offset |  | Net Assets |  | Cash Collateral Offset |  | Net Amount Presented
Non-trading commodity derivatives | $ | 3,642 |  |  | $ | (3,562 | ) |  | $ | 80 |  |  | $ | — |  |  | $ | 80 |
Trading commodity derivatives | 234 |  |  | (98 | ) |  | 136 |  |  | — |  |  | 136 |
Total Current Derivative Assets | 3,876 |  |  | (3,660 | ) |  | 216 |  |  | — |  |  | 216 |
Non-trading commodity derivatives | 313 |  |  | (313 | ) |  | — |  |  | — |  |  | — |
Total Non-current Derivative Assets | 313 |  |  | (313 | ) |  | — |  |  | — |  |  | — |
Total Derivative Assets | $ | 4,189 |  |  | $ | (3,973 | ) |  | $ | 216 |  |  | $ | — |  |  | $ | 216 |
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, 2015
Description | Gross Assets |  | Gross Amounts Offset |  | Net Assets |  | Cash Collateral Offset |  | Net Amount Presented
Non-trading commodity derivatives | $ | 292 |  |  | $ | (168 | ) |  | $ | 124 |  |  | $ | — |  |  | $ | 124 |
Trading commodity derivatives | 8 |  |  | (3 | ) |  | 5 |  |  | — |  |  | 5 |
Total Current Derivative Assets | 300 |  |  | (171 | ) |  | 129 |  |  | — |  |  | 129 |
Non-trading commodity derivatives | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Non-current Derivative Assets | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total Derivative Assets | $ | 300 |  |  | $ | (171 | ) |  | $ | 129 |  |  | $ | — |  |  | $ | 129 |
Offsetting Liabilities |
| September 30, 2015
Description | Gross Liabilities |  | Gross Amounts Offset |  | Net Liabilities |  | Cash Collateral Offset |  | Net Amount Presented
Non-trading commodity derivatives | $ | (12,239 | ) |  | $ | 5,845 |  |  | $ | (6,393 | ) |  | $ | — |  |  | $ | (6,393 | )
Trading commodity derivatives | (76 | ) |  | 32 |  |  | (44 | ) |  | — |  |  | (44 | )
Total Current Derivative Liabilities | (12,315 | ) |  | 5,877 |  |  | (6,437 | ) |  | — |  |  | (6,437 | )
Non-trading commodity derivatives | (1,346 | ) |  | 474 |  |  | (873 | ) |  | — |  |  | (873 | )
Total Non-current Derivative Liabilities | (1,346 | ) | v | 474 |  |  | (873 | ) |  | — |  |  | (873 | )
Total Derivative Liabilities | $ | (13,661 | ) |  | $ | 6,351 |  |  | $ | (7,310 | ) |  | $ | — |  |  | $ | (7,310 | )
| December 31, 2014
Description | Gross Liabilities |  | Gross Amounts Offset |  | Net Liabilities |  | Cash Collateral Offset |  | Net Amount Presented
Non-trading commodity derivatives | $ | (14,911 | ) |  | $ | 3,562 |  |  | $ | (11,349 | ) |  | $ | — |  |  | $ | (11,349 | )
Trading commodity derivatives | (275 | ) |  | 98 |  |  | (177 | ) |  | — |  |  | (177 | )
Total Current Derivative Liabilities | (15,186 | ) |  | 3,660 |  |  | (11,526 | ) |  | — |  |  | (11,526 | )
Non-trading commodity derivatives | (791 | ) |  | 313 |  |  | (478 | ) |  | — |  |  | (478 | )
Total Non-current Derivative Liabilities | (791 | ) |  | 313 |  |  | (478 | ) |  | — |  |  | (478 | )
Total Derivative Liabilities | $ | (15,977 | ) |  | $ | 3,973 |  |  | $ | (12,004 | ) |  | $ | — |  |  | $ | (12,004 | )

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