Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities (Derivative Positions and Subsequent Event) (Details)

v2.4.0.6
Derivative Instruments and Hedging Activities (Derivative Positions and Subsequent Event) (Details) (Commodity Contract [Member])
Dec. 31, 2012
Crude Oil [Member]
Average Floor Price per Hedge of $90 and Average Ceiling Price per Hedge of $116 [Member]
Dec. 31, 2012
Natural gas [Member]
Option
Dec. 31, 2012
Natural gas [Member]
Fixed-Price Swap per Instrument of $3.52 [Member]
Dec. 31, 2012
Natural gas [Member]
Average Floor Price per Instrument of $3.00 [Member]
Dec. 31, 2012
Natural gas [Member]
Average Ceiling Price per Instrument of $4.75 [Member]
Jan. 31, 2013
Subsequent Event [Member]
Crude Oil [Member]
Derivative Average Floor Price per Instrument of $101.30 and Average Ceiling Price per Instrument of $101.30 [Member]
Jan. 31, 2013
Subsequent Event [Member]
Crude Oil [Member]
Derivative Average Floor Price per Instrument of $93.35 and Average Ceiling Price per Instrument of $93.35 [Member]
Jan. 31, 2013
Subsequent Event [Member]
Crude Oil [Member]
Average Floor Price per Instrument of $70.00 [Member]
Derivative [Line Items]                
Number of options sold (in options)   2            
Derivative, Nonmonetary Notional Amount (in Volumes per Month) 40,000 [1],[2]   91,000 [3] 91,000 [3] 38,000 [3] 40,000 [4] 30,000 30,000 [4]
Derivative, Average Cap Price 116.00 [1],[2]   3.52 [3]     101.30 [4] 93.35 70.00 [4]
Average Ceiling Price per Hedge (in dollars per instrument) 90.00 [1],[2]     3.00 [3] 4.75 [3]      
[1] See "Subsequent Event" discussion below regarding the replacement of this crude oil derivative contract in January 2013.
[2] A collar is a combination of a sold call option (ceiling) and a purchased put option (floor).
[3] The natural gas swap, put and call option were executed contemporaneously. The "above market" $3.52/MMbtu swap price the Company received was offset by the value of the two options sold by the Company. The short natural gas put option, when combined with the swap, creates the potential for a reduction in the effective swap price if NYMEX natural gas prices are below $3.00/MMbtu in 2013. The short natural gas call option, when combined with the Company's long production position, represents a "covered call," and creates a $4.75/MMbtu ceiling during the covered period.
[4] During January 2013, the Company monetized the remaining portion (Feb13-Dec13) of its 2013 crude oil collar positions of 40 Bbls per month reflected in previous table. The proceeds from this transaction, combined with the proceeds from the sale of the listed put for 30 Bbls per month, were used to finance the uplift in the crude oil swap for the period Feb13-Dec13.