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Accounting for Derivative Instruments (Tables) | 6 Months Ended
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Jun. 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 |  | June 30, 2015 |  | December 31, 2014
Natural Gas | MMBtu |  | 6,677 |  |  | 9,690 |
Natural Gas Basis | MMBtu |  | 1,303 |  |  | 2,710 |
Electricity | MWh |  | 789 |  |  | 607 |
Trading
Commodity | Notional |  | June 30, 2015 |  | December 31, 2014
Natural Gas | MMBtu |  | 627 |  |  | (155 | )
Natural Gas Basis | MMBtu |  | (78 | ) |  | (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 June 30,
| 2015 |  | 2014
Loss on non-trading derivatives, net (including loss on non-trading derivatives—affiliates, net of $0 and $157 for the three months ended June 30, 2015 and 2014, respectively) | $ | (4,041 | ) |  | $ | (4,438 | )
Gain (loss) on trading derivatives, net (including loss on trading derivatives—affiliates, net of $0 and $866 for the three months ended June 30, 2015 and 2014, respectively) | (14 | ) |  | 419 |
Loss on derivatives, net | (4,055 | ) |  | (4,019 | )
Current period settlements on non-trading derivatives | 4,328 |  |  | (97 | )
Current period settlements on trading derivatives (including current period settlements on trading derivatives—affiliates, net of $0 and $866 for the three months ended June 30, 2015 and 2014, respectively) | 29 |  |  | 38 |
Total current period settlements on derivatives | $ | 4,357 |  |  | $ | (59 | )
| Six Months Ended June 30,
| 2015 |  | 2014
Gain (loss) on non-trading derivatives, net | $ | (5,241 | ) |  | $ | 7,010 |
Loss on trading derivatives, net (including loss on trading derivatives—affiliates, net of $0 and $1,792 for the six months ended June 30, 2015 and 2014, respectively) | (119 | ) |  | (5,570 | )
Gain (loss) on derivatives, net | (5,360 | ) |  | 1,440 |
Current period settlements on non-trading derivatives | 8,442 |  |  | (12,998 | )
Current period settlements on trading derivatives (including current period settlements on trading derivatives—affiliates, net of $0 and $1,693 for the six months ended June 30, 2015 and 2014, respectively) | 105 |  |  | 2,742 |
Total current period settlements on derivatives | $ | 8,547 |  |  | $ | (10,256 | )
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):
| June 30, 2015
Description | Gross Assets |  | Gross Amounts Offset |  | Net Assets |  | Cash Collateral Offset |  | Net Amount Presented
Non-trading commodity derivatives | $ | 2,370 |  |  | $ | (1,478 | ) |  | $ | 892 |  |  | $ | — |  |  | $ | 892 |
Trading commodity derivatives | 106 |  |  | (74 | ) |  | 32 |  |  | — |  |  | 32 |
Total Current Derivative Assets | 2,476 |  |  | (1,552 | ) |  | 924 |  |  | — |  |  | 924 |
Non-trading commodity derivatives | 400 |  |  | (400 | ) |  | — |  |  | — |  |  | — |
Total Non-current Derivative Assets | 400 |  |  | (400 | ) |  | — |  |  | — |  |  | — |
Total Derivative Assets | $ | 2,876 |  |  | $ | (1,952 | ) |  | $ | 924 |  |  | $ | — |  |  | $ | 924 |
| 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 |
Offsetting Liabilities |
| 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 | )
| June 30, 2015
Description | Gross Liabilities |  | Gross Amounts Offset |  | Net Liabilities |  | Cash Collateral Offset |  | Net Amount Presented
Non-trading commodity derivatives | $ | (10,385 | ) |  | $ | 1,478 |  |  | $ | (8,907 | ) |  | $ | 210 |  |  | $ | (8,697 | )
Trading commodity derivatives | (202 | ) |  | 74 |  |  | (128 | ) |  | — |  |  | (128 | )
Total Current Derivative Liabilities | (10,587 | ) |  | 1,552 |  |  | (9,035 | ) |  | 210 |  |  | (8,825 | )
Non-trading commodity derivatives | (931 | ) |  | 400 |  |  | (531 | ) |  | — |  |  | (531 | )
Total Non-current Derivative Liabilities | (931 | ) |  | 400 |  |  | (531 | ) |  | — |  |  | (531 | )
Total Derivative Liabilities | $ | (11,518 | ) |  | $ | 1,952 |  |  | $ | (9,566 | ) |  | $ | 210 |  |  | $ | (9,356 | )

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