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Contingencies and Other Commitments (Details) - Pending Litigation [Member] $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 18, 2016 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2016 USD ($) | Feb. 28, 2015 patient | Apr. 24, 2014 facilities | Aug. 12, 2013 facilities | Mar. 04, 2013 patient facilities
Honts lawsuit [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of hospitals involved in lawsuit | facilities |  |  |  |  |  | 1 |
Punitive damages awarded in favor of plaintiff | $ 20.0 |  |  |  |  |  |
Other operating expenses |  |  | $ 5.7 |  |  |  |
Loss contingency accrual |  | $ 20.1 |  |  |  |  |
Loss contingency receivable accrued |  | 15.5 |  |  |  |  |
Portion of liability that would be covered through captive insurance subsidiary |  | $ 6.0 |  |  |  |  |
HHS-OIG Investigation [Member] |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of hospitals that received subpoenas | facilities |  |  |  |  | 7 |  | 4
Number of patient medical records requested for each hospital in subpoenas | patient |  |  |  |  |  |  | 100
Number of hospitals that received supplemental subpoenas | facilities |  |  |  |  | 2 |  |
Number of additional patient medical records requested | patient |  |  |  | 70 |  |  |
Compliance threshold under Health Care Act (percent) |  | 60.00% |  |  |  |  |

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- Definition Maximum coverage per malpractice claim provided by the insurance arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 450 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491354&loc=d3e6049-115624 + Details
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