Long-Term Debt Minimum EBITDAX Covenant (Details) - Minimum [Member] - Combined Credit Agreements [Member] $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($)
Twelve months ending September 30, 2015 [Member]
Debt Instrument [Line Items]
Minimum EBITDAX Covenant	$ 120.5
Twelve months ending December 31, 2015 [Member]
Debt Instrument [Line Items]
Minimum EBITDAX Covenant	$ 122.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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