Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities (Narrative) (Details)

v2.4.0.6
Derivative Instruments and Hedging Activities (Narrative) (Details) (Natural gas [Member], Commodity Contract [Member])
 3 Months Ended
Jun. 30, 2012
Derivative [Line Items]  
Number of options sold (in options) 2
Not Designated as Hedging Instrument [Member] | Average Floor Price per Instrument of $3.52 and Average Ceiling Price per of $3.52 Intruments [Member]
  
Derivative [Line Items]  
Maturity range related to swaps 15 months
Average Floor Price per Hedge (in dollars per instrument) 3.52 [1]
Average Ceiling Price per Hedge (in dollars per instrument) 3.52 [1]
Fixed price (in MMBtu) 3.52
Derivative, Nonmonetary Notional Amount (in MMBtu) 1,371
Not Designated as Hedging Instrument [Member] | Average Floor Price per Instrument of $3.00 [Member]
  
Derivative [Line Items]  
Average Floor Price per Hedge (in dollars per instrument) 3.00 [1]
Not Designated as Hedging Instrument [Member] | Average Ceiling Price per Instrument of $4.75 [Member]
  
Derivative [Line Items]  
Average Ceiling Price per Hedge (in dollars per instrument) 4.75 [1]
[1] The natural gas swap, put and call option were executed contemporaneously. The "above market" 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.