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Concentration of Risk	12 Months Ended
Concentration of Risk	Dec. 31, 2017
Risks and Uncertainties [Abstract]
Concentration of Risk	14. Concentration of Risk The Company’s facilities in Louisiana, Mississippi, Alabama, Arkansas, and Tennessee accounted for approximately 55.0%, 58.4% and 61.1% of net service revenue during the years ended December 31, 2017, 2016 and 2015, respectively. Any material change in the current economic or competitive conditions in these states could have a disproportionate effect on the Company’s overall business results.