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Derivative Financial Instruments (Details 3) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 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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Jun. 30, 2012
Crude oil
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Jun. 30, 2011
Crude oil
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Jun. 30, 2012
Crude oil
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Jun. 30, 2011
Crude oil
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Jun. 30, 2012
Natural gas
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Jun. 30, 2011
Natural gas
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Jun. 30, 2012
Natural gas
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Jun. 30, 2011
Natural gas
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Jun. 30, 2012
Natural gas liquids ("NGLs")
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Jun. 30, 2011
Natural gas liquids ("NGLs")
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Jun. 30, 2012
Natural gas liquids ("NGLs")
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Jun. 30, 2011
Natural gas liquids ("NGLs")
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Jun. 30, 2012
Convertible Debt [Member]
|
Dec. 31, 2011
Convertible Debt [Member]
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| Unrealized and realized gain and loss from derivative cash settlements and changes in fair value of derivative contracts | ||||||||||||||||||
| Cash settlement (gain) and loss | $ (16,446) | $ 13,976 | $ (21,882) | $ 20,393 | $ 2,371 | $ 10,633 | $ 10,670 | $ 17,363 | $ (16,252) | $ (590) | $ (31,464) | $ (2,317) | $ (2,565) | $ 3,933 | $ (1,088) | $ 5,347 | ||
| Unrealized (gain) loss on changes in fair value | 81,666 | 57,852 | 74,014 | (24,160) | 92,774 | 51,216 | 63,283 | (16,151) | (29,867) | 6,681 | (12,233) | 2,421 | 18,759 | (45) | 22,964 | (10,430) | ||
| Unrealized and Realized Derivative (Gain) Loss | (98,112) | (43,876) | (95,896) | 44,553 | ||||||||||||||
| Amount of (gain) loss reclassified from AOCL to realized hedge gain (loss) | (116) | 3,951 | (1,150) | 4,878 | ||||||||||||||
| Realized hedge gain (loss) | $ 185 | $ (6,330) | $ 1,837 | $ (7,705) | ||||||||||||||
| Interest rate on notes (as a percent) | 3.50% | 3.50% | ||||||||||||||||