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The Company and Business	9 Months Ended
The Company and Business	Sep. 30, 2015
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 and condensate, natural gas, and natural gas liquids (also respectively referred to as “oil,” “gas,” and “NGLs” throughout this report) in onshore North America.