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Basis of Presentation Summary of Significant Accounting Policies - Textual (Details)	9 Months Ended
	Sep. 30, 2018 state
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of states in which entity operates	36
Collection success rate of denied payments (percent)	70.00%
RAC Audits [Member] | Medicare [Member] | Payor Source [Member] | Net operating revenues [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net operating revenues by payor source (percent)	1.00%

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- Definition

The historical collection percentage of accounts receivable that have been denied and appealed up to an administrative law judge hearing as of the balance sheet date. The denial of certain diagnosis codes by Medicare contractors are based on medical necessity and in most instances are disputed or appealed by the Company.

+ References

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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