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Derivative Instruments and Hedging Activities (Derivative Positions and Subsequent Event) (Details)
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3 Months Ended | 1 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2014
Call Options Price $4.75 [Member]
Natural Gas [Member]
Call Option [Member]
Long [Member]
MMBTU
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Mar. 31, 2014
Call Options Price $4.75 [Member]
Natural Gas [Member]
Call Option [Member]
Short [Member]
MMBTU
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Swap Price $4.25 [Member]
Natural Gas [Member]
Swap [Member]
MMBTU
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Call Option Strike Price $5.00 [Member]
Natural Gas [Member]
Call Option [Member]
MMBTU
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Put Option Strike Price $70.00 [Member]
Crude Oil [Member]
Put Option [Member]
bbl
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Swap Price $93.35 [Member]
Crude Oil [Member]
Swap [Member]
bbl
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Swap Price $94.58 [Member]
Crude Oil [Member]
Swap [Member]
bbl
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Swap Price $92.80 [Member]
Crude Oil [Member]
Swap [Member]
bbl
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Swap Price $90.40 [Member]
Crude Oil [Member]
Swap [Member]
bbl
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Mar. 31, 2014
Not Designated as Hedging Instrument [Member]
Swap Price $88.35 [Member]
Crude Oil [Member]
Swap [Member]
bbl
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Apr. 30, 2014
Not Designated as Hedging Instrument [Member]
Subsequent Event [Member]
Swap Price $99.87 [Member]
Crude Oil [Member]
Swap [Member]
bbl
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Apr. 30, 2014
Not Designated as Hedging Instrument [Member]
Subsequent Event [Member]
Swap Price $96.92 [Member]
Crude Oil [Member]
Swap [Member]
bbl
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| Derivative [Line Items] | ||||||||||||
| Average notional volumes per month, energy | 38,000 | 38,000 | 61,000 | 37,000 | ||||||||
| Average notional volumes per month, volume | 30,000 | 30,000 | 9,000 | 15,000 | 15,000 | 15,000 | 31,000 | 21,000 | ||||
| Strike price | 4.75 | 4.75 | 5.00 | 70.00 | ||||||||
| Swap price | 4.25 | 93.35 | 94.58 | 92.80 | 90.40 | 88.35 | 99.87 | 96.92 | ||||