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Presentation of Financial Statements	9 Months Ended
Presentation of Financial Statements	Sep. 30, 2016
Basis of Presentation and Presentation of Financial Statements [Abstract]
Presentation of Financial Statements	2. Presentation of Financial Statements The condensed unaudited interim consolidated financial statements included herein include the accounts of Medifast, Inc. (the “Company”) and its wholly-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.