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Derivative and Hedging Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Derivative and Hedging Instruments (Tables) [Abstract] |
Gross Notional Volume of Open Derivatives |
|  | March 31, 2013 |  | December 31, 2012 |
| Commodity derivative contracts | 331,315 MWh |  | 444,650 MWh |
| Commodity derivative contracts | 1,360,000 Dth |  | 1,980,000 Dth |
| FTRs | 1,085 MW |  | 2,670 MW |
Fair Value of Derivative Instruments on the Balance Sheet |
| Asset Derivatives |  | Liability Derivatives
(In thousands) | Balance Sheet Location |  | Fair Value |  | Balance Sheet Location |  | Fair Value
March 31, 2013 |  |  |  |  |  |  |
Commodity derivative contracts | Other current assets | $ | 1,343 | Derivative liability (current) | $ | 30
Commodity derivative contracts | Other deferred charges |  | 158 |  | Derivative liability (long-term) |  | 0
FTRs | Other current assets |  | 22 |  | Derivative liability (current) |  | 0
Ten-year PPA | N/A |  | N/A |  | Derivative liability (current) |  | 8,880
Ten-year PPA | N/A |  | N/A |  | Derivative liability (long-term) |  | 61,810
December 31, 2012 |  |  |  |  |  |  |
Commodity derivative contracts | Other current assets | $ | 365 |  | Derivative liability (current) | $ | 394
Commodity derivative contracts | Other deferred charges |  | 95 |  | Derivative liability (long-term) |  | 11
FTRs | Other current assets |  | 206 |  | Derivative liability (current) |  | 0
Ten-year PPA | N/A |  | N/A |  | Derivative liability (current) |  | 9,270
Ten-year PPA | N/A |  | N/A |  | Derivative liability (long-term) |  | 63,320
Offsetting Assets |
| Offsetting of Derivative Assets |
|  |  |  |  | Gross amounts |  | Collateral |  | Net amount |
|  |  |  |  | offset in |  | posted against |  | presented in |
| (In thousands) |  | Gross amounts |  | balance sheet |  | derivative positions |  | balance sheet |
| March 31, 2013 |  |  |  |  |  |  |  |  |
| Commodity derivative contracts | $ | 1,502 | $ | (30) | $ | (465) | $ | 1,007 |
| FTRs |  | 22 |  | - |  | - |  | 22 |
| December 31, 2012 |  |  |  |  |  |  |  |  |
| Commodity derivative contracts | $ | 460 | $ | (405) | $ | - | $ | 55 |
| FTRs |  | 206 |  | - |  | - |  | 206 |
Offsetting Liabilities |
| Offsetting of Derivative Liabilities |
|  |  |  |  | Gross amounts |  | Collateral |  | Net amount |
|  |  |  |  | offset in |  | posted against |  | presented in |
| (In thousands) |  | Gross amounts |  | balance sheet |  | derivative positions |  | balance sheet |
| March 31, 2013 |  |  |  |  |  |  |  |  |
| Commodity derivative contracts | $ | 30 | $ | (30) | $ | - | $ | - |
| Ten-year PPA |  | 70,690 |  | - |  | - |  | 70,690 |
| December 31, 2012 |  |  |  |  |  |  |  |  |
| Commodity derivative contracts | $ | 405 | $ | (405) | $ | - | $ | - |
| Ten-year PPA |  | 72,590 |  | - |  | - |  | 72,590 |
Derivative Gains and Losses in Balance Sheet |
|  | 2013 |  |  | 2012
(In thousands) |  | Current and long-term regulatory asset |  | Other current assets |  |  | Current and long-term regulatory asset |  | Other current assets
Three Months Ended March 31: |  |  |  |  |  |  |  |  |
Balance at January 1, | $ | 72,329 | $ | 574 |  | $ | 42,356 | $ | 1,604
Change in unrealized (gain) loss |  | (1,697) |  | 0 |  |  | 33,310 |  | 0
Realized loss reclassified to a deferred account |  | (290) |  | 290 |  |  | (2,658) |  | 2,658
Realized loss reclassified to income |  |  |  |  |  |  |  |  |
statement |  | (1,145) |  | (605) |  |  | (1,494) |  | (3,590)
Balance at March 31, | $ | 69,197 | $ | 259 |  | $ | 71,514 | $ | 672
Derivative Gains and Losses in Income Statement |
|  |  | Realized losses (gains) |
|  |  |  |  | Fuel for electric |  |  |
|  |  | Regulated |  | generation/ |  | Cost of |
| (In thousands) |  | gas revenues |  | purchased power |  | gas sold |
| Three Months Ended March 31, 2013: |  |  |  |  |  |  |
| Commodity derivative contracts | $ | 0 | $ | 22 | $ | 608 |
| FTRs |  | 0 |  | (158) |  | 0 |
| Ten-year PPA |  | 0 |  | 1,278 |  | 0 |
| Three Months Ended March 31, 2012: |  |  |  |  |  |  |
| Commodity derivative contracts | $ | 0 | $ | 1,928 | $ | 3,090 |
| FTRs |  | 0 |  | 66 |  | 0 |
| Ten-year PPA |  | 0 |  | 0 |  | 0 |

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