Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	$ 62,210	$ 85,524
Derivative liabilities	1,162	1,748
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, assets	(807)	(1,175)
Assets at Fair Value	70,452	94,455
Netting adjustments, liabilities	(807)	(1,175)
Liabilities at fair value	10,132	32,869
Fair Value, Measurements, Recurring \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, assets	(807)	(1,175)
Assets at Fair Value	61,403	84,349
Netting adjustments, liabilities	(807)	(1,175)
Liabilities at fair value	355	573
Fair Value, Measurements, Recurring \| Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, assets	0	0
Assets at Fair Value	9,049	10,106
Fair Value, Measurements, Recurring \| Debt holder conversion feature
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, liabilities	0	0
Liabilities at fair value	7,281	29,355
Fair Value, Measurements, Recurring \| Mandatory prepayment feature - PGC Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Netting adjustments, liabilities	0	0
Liabilities at fair value	2,496	2,941
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	9,049	10,106
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1 \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1 \| Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	9,049	10,106
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1 \| Debt holder conversion feature
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 1 \| Mandatory prepayment feature - PGC Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	62,210	85,524
Derivative liabilities	2,496	2,941
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2 \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	62,210	85,524
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2 \| Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2 \| Debt holder conversion feature
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative liabilities	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 2 \| Mandatory prepayment feature - PGC Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative liabilities	2,496	2,941
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0	0
Derivative liabilities	8,443	31,103
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3 \| Commodity derivative contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0	0
Derivative liabilities	1,162	1,748
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3 \| Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative assets	0	0
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3 \| Debt holder conversion feature
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative liabilities	7,281	29,355
Fair Value, Measurements, Recurring \| Fair Value Measurements Level 3 \| Mandatory prepayment feature - PGC Senior Secured Notes
Fair Value, Assets and Liabilities Measured on Recurring Basis
Derivative liabilities	$ 0	$ 0

Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, and obligation to return cash collateral under master netting arrangements.

+ References

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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