Divestitures and Discontinued Operations Additional Information (Details) (USD $)	12 Months Ended
Dec. 31, 2013
Shallow Upper Devonian Sale
Additional Disclosures
Oil and gas assets sale price before adjustments	$ 20,600,000
Proceeds from Sale of Oil and Gas Property and Equipment	900,000
Purchase Price - Notes Receivable	3,300,000
Purchase Price - Accounts Receivable	800,000
Piceance and NECO Asset Group
Additional Disclosures
Proceeds from Sale of Oil and Gas Property and Equipment	177,600,000
Proceeds To Non-Affiliated Investor Partners	17,000,000
Pre-tax loss on sale of crude oil and gas properties	(2,300,000)
Shallow Upper Devonian Sale \| PDCE proportionate share
Additional Disclosures
Oil and gas assets sale price before adjustments	5,100,000
Shallow Upper Devonian Letter of Credit
Additional Disclosures
Letters of Credit Novated	$ 6,700,000

Oil and gas assets sale price before adjustments

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Proceeds To non-Affiliated Investor Partners as a result of the disposal of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

+ References

No definition available.

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Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.

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-Publisher FASB

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-Section S99

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Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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An amount representing an agreement for an unconditional promise by the maker to pay the Entity (holder) a definite sum of money at a future date more than one year from the balance sheet date, net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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-Publisher FASB

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-Glossary Investing Activities

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