DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT (Details) (USD $) | 3 Months Ended | 9 Months Ended |
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Total volumes of open contracts | 6,900,000 | ' | 6,900,000 | ' |
Weighted average price on open contracts | 89.95 | ' | 89.95 | ' |
Oil Swap 1 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 300,000 | ' |
Fixed Price (in dollars per barrel) | 91.65 | ' | 91.65 | ' |
Oil Swap 1 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 1 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 2 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Fixed Price (in dollars per barrel) | 89.5 | ' | 89.5 | ' |
Oil Swap 2 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 2 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Oil Swap 3 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 60,000 | ' |
Fixed Price (in dollars per barrel) | 91.1 | ' | 91.1 | ' |
Oil Swap 3 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 3 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Oil Swap 4 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 30,000 | ' |
Fixed Price (in dollars per barrel) | 94.5 | ' | 94.5 | ' |
Oil Swap 4 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 4 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Oil Swap 5 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 30,000 | ' |
Fixed Price (in dollars per barrel) | 102.3 | ' | 102.3 | ' |
Oil Swap 5 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 5 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Oil Swap 6 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 30,000 | ' |
Fixed Price (in dollars per barrel) | 94.5 | ' | 94.5 | ' |
Oil Swap 6 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 6 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Oil Swap 7 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 356,250 | ' |
Fixed Price (in dollars per barrel) | 88.55 | ' | 88.55 | ' |
Oil Swap 7 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 7 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 8 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 356,250 | ' |
Fixed Price (in dollars per barrel) | 88.6 | ' | 88.6 | ' |
Oil Swap 8 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 8 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 9 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 356,250 | ' |
Fixed Price (in dollars per barrel) | 88.4 | ' | 88.4 | ' |
Oil Swap 9 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 9 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 10 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 356,250 | ' |
Fixed Price (in dollars per barrel) | 88.5 | ' | 88.5 | ' |
Oil Swap 10 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 10 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 11 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 510,000 | ' |
Fixed Price (in dollars per barrel) | 89.15 | ' | 89.15 | ' |
Oil Swap 11 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 11 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-15 | ' |
Oil Swap 12 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 810,000 | ' |
Fixed Price (in dollars per barrel) | 89 | ' | 89 | ' |
Oil Swap 12 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil Swap 12 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-15 | ' |
Oil Swap 13 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 300,000 | ' |
Fixed Price (in dollars per barrel) | 89.5 | ' | 89.5 | ' |
Oil Swap 13 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 13 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-14 | ' |
Oil Swap 14 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 240,000 | ' |
Fixed Price (in dollars per barrel) | 90 | ' | 90 | ' |
Oil Swap 14 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 14 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-14 | ' |
Oil Swap 15 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 240,000 | ' |
Fixed Price (in dollars per barrel) | 100 | ' | 100 | ' |
Oil Swap 15 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 15 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-14 | ' |
Oil Swap 16 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Fixed Price (in dollars per barrel) | 91.35 | ' | 91.35 | ' |
Oil Swap 16 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 16 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 17 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Fixed Price (in dollars per barrel) | 90 | ' | 90 | ' |
Oil Swap 17 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 17 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 18 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 240,000 | ' |
Fixed Price (in dollars per barrel) | 90.15 | ' | 90.15 | ' |
Oil Swap 18 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 18 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 19 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 240,000 | ' |
Fixed Price (in dollars per barrel) | 91 | ' | 91 | ' |
Oil Swap 19 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 19 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 20 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Fixed Price (in dollars per barrel) | 93 | ' | 93 | ' |
Oil Swap 20 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil Swap 20 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 21 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Fixed Price (in dollars per barrel) | 90 | ' | 90 | ' |
Oil Swap 21 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jul-14 | ' |
Oil Swap 21 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 22 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Fixed Price (in dollars per barrel) | 90 | ' | 90 | ' |
Oil Swap 22 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jul-14 | ' |
Oil Swap 22 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 23 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Fixed Price (in dollars per barrel) | 93.5 | ' | 93.5 | ' |
Oil Swap 23 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jul-14 | ' |
Oil Swap 23 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 24 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 30,000 | ' |
Fixed Price (in dollars per barrel) | 90.58 | ' | 90.58 | ' |
Oil Swap 24 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jul-14 | ' |
Oil Swap 24 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Oil Swap 25 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 60,000 | ' |
Fixed Price (in dollars per barrel) | 90.5 | ' | 90.5 | ' |
Oil Swap 25 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 25 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-15 | ' |
Oil Swap 26 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 180,000 | ' |
Fixed Price (in dollars per barrel) | 88.55 | ' | 88.55 | ' |
Oil Swap 26 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 26 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-15 | ' |
Oil Swap 27 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 180,000 | ' |
Fixed Price (in dollars per barrel) | 88 | ' | 88 | ' |
Oil Swap 27 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 27 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-15 | ' |
Oil Swap 29 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 60,000 | ' |
Fixed Price (in dollars per barrel) | 90.25 | ' | 90.25 | ' |
Oil Swap 29 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 29 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-15 | ' |
Oil Swap 28 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 60,000 | ' |
Fixed Price (in dollars per barrel) | 90.75 | ' | 90.75 | ' |
Oil Swap 28 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 28 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 30-Jun-15 | ' |
Oil Swap 30 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 360,000 | ' |
Fixed Price (in dollars per barrel) | 89 | ' | 89 | ' |
Oil Swap 30 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 30 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-15 | ' |
Oil Swap 31 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 360,000 | ' |
Fixed Price (in dollars per barrel) | 89.02 | ' | 89.02 | ' |
Oil Swap 31 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 31 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-15 | ' |
Oil Swap 32 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 180,000 | ' |
Fixed Price (in dollars per barrel) | 89 | ' | 89 | ' |
Oil Swap 32 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 32 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-15 | ' |
Oil Swap 33 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Oil (in barrels) | ' | ' | 180,000 | ' |
Fixed Price (in dollars per barrel) | 89 | ' | 89 | ' |
Oil Swap 33 [Member] | Minimum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-15 | ' |
Oil Swap 33 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-15 | ' |
Collar 1 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 32,187 | ' |
Price minimum (in dollars per barrel) | $90 | ' | $90 | ' |
Price maximum (in dollars per barrel) | $103.50 | ' | $103.50 | ' |
Collar 1 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 2 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 28,481 | ' |
Price minimum (in dollars per barrel) | $90 | ' | $90 | ' |
Price maximum (in dollars per barrel) | $106.50 | ' | $106.50 | ' |
Collar 2 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 3 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 49,412 | ' |
Price minimum (in dollars per barrel) | $90 | ' | $90 | ' |
Price maximum (in dollars per barrel) | $110 | ' | $110 | ' |
Collar 3 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 4 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 39,737 | ' |
Price minimum (in dollars per barrel) | $95 | ' | $95 | ' |
Price maximum (in dollars per barrel) | $107 | ' | $107 | ' |
Collar 4 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 5 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 120,000 | ' |
Price minimum (in dollars per barrel) | $95 | ' | $95 | ' |
Price maximum (in dollars per barrel) | $110.70 | ' | $110.70 | ' |
Collar 5 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 6 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 170,047 | ' |
Price minimum (in dollars per barrel) | $85 | ' | $85 | ' |
Price maximum (in dollars per barrel) | $98 | ' | $98 | ' |
Collar 6 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 7 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 30,000 | ' |
Price minimum (in dollars per barrel) | $90.25 | ' | $90.25 | ' |
Price maximum (in dollars per barrel) | $97.95 | ' | $97.95 | ' |
Collar 7 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 8 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 48,000 | ' |
Price minimum (in dollars per barrel) | $95 | ' | $95 | ' |
Price maximum (in dollars per barrel) | $106.90 | ' | $106.90 | ' |
Collar 8 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 9 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Oct-13 | ' |
Oil (in barrels) | ' | ' | 15,000 | ' |
Price minimum (in dollars per barrel) | $93 | ' | $93 | ' |
Price maximum (in dollars per barrel) | $100 | ' | $100 | ' |
Collar 9 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-13 | ' |
Collar 10 [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 1-Jan-14 | ' |
Oil (in barrels) | ' | ' | 240,000 | ' |
Price minimum (in dollars per barrel) | $90 | ' | $90 | ' |
Price maximum (in dollars per barrel) | $99.05 | ' | $99.05 | ' |
Collar 10 [Member] | Maximum [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Settlement Period | ' | ' | 31-Dec-14 | ' |
Not Designated as Hedging Instrument [Member] | ' | ' | ' | ' |
Crude Oil Derivative Contracts Cash-flow Not Designated as Hedges [Abstract] | ' | ' | ' | ' |
Realized gain (loss) on price risk derivatives not designated as hedges | ($8,096,075) | $1,701,296 | ($8,966,175) | ($4,729,186) |
Unrealized gain (loss) on price risk derivatives not designated as hedges | ($29,353,161) | ($22,308,470) | ($27,254,147) | $18,125,928 |