Summary of Significant Accounting Policies Schedule of Revenue (Details) - Revenue	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Composition of patient care service revenue	100.00%	100.00%	100.00%
Medicare and Medicare Advantage
Concentration Risk [Line Items]
Composition of patient care service revenue	68.00%	66.00%	61.00%
Commercial and other
Concentration Risk [Line Items]
Composition of patient care service revenue	27.00%	30.00%	35.00%
Medicaid and Managed Medicaid
Concentration Risk [Line Items]
Composition of patient care service revenue	4.00%	4.00%	3.00%
Other
Concentration Risk [Line Items]
Composition of patient care service revenue	1.00%	0.00%	1.00%

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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