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COMMITMENTS AND CONTINGENCIES Narrative (Details) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|---|---|
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Jul. 31, 2012
Grace Energy Corporation Matter [Member]
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Jun. 30, 2012
Grace Energy Corporation Matter [Member]
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| Loss Contingencies [Line Items] | ||||||
| Loss Contingency Accrual, at Carrying Value | $ 13,300,000 | $ 13,300,000 | ||||
| Court Judgment, Remediation Costs Not Recoverable by Plaintiff | 3,500,000 | |||||
| Court Judgment, Attorney Costs Awarded to Plaintiff | 1,800,000 | |||||
| Deptartment of Justice Estimated Remediation Expenses | 71,900,000 | |||||
| Payments for Legal Settlements | 13,100,000 | |||||
| Gain on legal settlement | $ 28,738,000 | $ 0 | $ 28,738,000 | $ 0 | $ 28,700,000 | |