(3) Investments in Piceance Energy (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2013	Jun. 04, 2012
Number of hedging units	15,000
Derivative, Floor Price	$ 3.37
Derivative, Average Cap Price	$ 4.28
Derivative, Average Floor Price	$ 3.46
Piceance Energy
Capital contributions by member	$ 60
Secured revolving credit facility	400.0
Initial borrowing base	140
Piceance Energy \| Reorganized Delta Petroleum
Ownership interest held in Piceance Energy, percentage	33.34%	33.34%
Capital contributions by member	$ (20)

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

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The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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Floor rate on a price risk derivative such as a floor or a collar. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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-Name Statement of Financial Accounting Standard (FAS)

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Capital contributed by limited partners. The limited partners are partners of a publicly traded limited partnership or master limited partnership. Limited partners have limited liability and do not manage the partnership.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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