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Sale of Businesses	12 Months Ended
Sale of Businesses	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Sale of Businesses	Sale of Businesses The Company recognized a non-operating gain of $35.6 million resulting from the sale of businesses during the year ended December 31, 2016. The non-operating gain was the result of the sale of the Company’s contract therapy businesses for $65.0 million, resulting in a non-operating gain of $33.9 million, and the sale of nine outpatient rehabilitation clinics to an entity the Company holds as an equity method investment, resulting in a non-operating gain of $1.7 million.