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Property, Pland and Equipment - Additional Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Repsol E&P USA, Inc.	Jun. 30, 2014 Repsol E&P USA, Inc.	Jun. 30, 2013 Atinum MidCon I, LLC and Repsol E&P USA, Inc.	Jun. 30, 2014 Maximum Repsol E&P USA, Inc. Potential drilling carry costs
Property, Plant and Equipment
Cumulative full cost ceiling limitation impairment	$ 3,700.0	$ 3,500.0
Full cost ceiling limitation impairment	164.8
Drilling carry received or billed				175.4	248.3
Minimum net wells			484
Total drilling carry						$ 75.0
Net wells			143

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- Definition

Drilling Carry Received or Billed.

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- Definition

Minimum number of net wells required to be drilled in the area of mutual interest under terms of agreement.

+ References

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- Definition

Number of net wells drilled in the area of mutual interest as of a specified date.

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- Definition

Oil and Gas Property, Cumulative Impairment based on Ceiling Test Calculation.

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- Definition

Total Drilling Carry

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- Definition

The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 4(ii)

-Article 4

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