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The Company and Business	9 Months Ended
The Company and Business	Sep. 30, 2012
Company and Business Disclosure [Abstract]
The Company and Business	Note 1 - The Company and Business SM Energy Company (“SM Energy” or the “Company”) is an independent energy company engaged in the acquisition, exploration, development, and production of crude oil, natural gas, and natural gas liquids (also respectively referred to as “oil”, “gas”, and “NGLs” throughout this report) in onshore North America, with a current focus on oil and NGL-rich resource plays.