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DERIVATIVES AND RISK MANAGEMENT ACTIVITIES Table 3 (Details) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2011
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|---|---|
| Derivative [Line Items] | |
| Notional Amount | $ 500,000 |
| Weighted- Average Fixed Rate | 3.30% |
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Forward-starting interest rate swap 1 [Member]
|
|
| Derivative [Line Items] | |
| Notional Amount | 125,000 |
| Period of Hedge (month/year) | 03/13 – 03/23 |
| Weighted- Average Fixed Rate | 3.50% |
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Forward-starting interest rate swap 2 [Member]
|
|
| Derivative [Line Items] | |
| Notional Amount | 150,000 |
| Period of Hedge (month/year) | 06/13 – 06/23 |
| Weighted- Average Fixed Rate | 3.50% |
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Forward-starting interest rate swap 3 [Member]
|
|
| Derivative [Line Items] | |
| Notional Amount | $ 225,000 |
| Period of Hedge (month/year) | 02/12 – 02/22 |
| Weighted- Average Fixed Rate | 3.10% |