|
Derivative Instruments (Fair Market Value of Derivative Instruments Included on the Balance Sheet) (Details) (USD $)
|
9 Months Ended | |||||
|---|---|---|---|---|---|---|
|
Sep. 30, 2012
|
Dec. 31, 2011
|
Sep. 30, 2012
[MaximumMember]
|
Dec. 31, 2011
[OilAndGasCommodityDerivativesMember]
[PrepaidExpensesAndOtherCurrentAssetsMember]
|
Sep. 30, 2012
[OilAndGasCommodityDerivativesMember]
[OtherLiabilitiesMember]
|
Dec. 31, 2011
[OilAndGasCommodityDerivativesMember]
[OtherLiabilitiesMember]
|
|
| Derivatives, Fair Value [Line Items] | ||||||
| Derivative Asset, Fair Value, Net | $ 104,000 | $ 1,247,000 | ||||
| Embedded Derivative, Fair Value of Embedded Derivative Liability | (14,825,000) | (16,067,000) | (14,825,000) | (16,067,000) | ||
| Derivative, Loss on Derivative | $ 100,000 |