Commitments and Contingencies (Narrative) (Details)	3 Months Ended		32 Months Ended
	Mar. 31, 2017 USD ($) lawsuit facility policy	Mar. 31, 2016 USD ($)	Feb. 29, 2016 civil_investigative_demand	Oct. 31, 2014 facility
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	68
Cash expenditures for self-insured professional liability costs	$ 2,071,000	$ 613,000
Other Insurance
Liability for workers compensation claims	515,000
Workers compensation insurance, non current receivable for excess premiums paid	1,138,000
Health insurance, maximum self-insured annual amount per individual	$ 175,000
Unfavorable regulatory action | Potential violations of false claims act
Malpractice Insurance [Line Items]
Number of facilities | facility	6			2
Number of new claims filed | civil_investigative_demand			3
Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Liability for reported and estimated future claims	$ 19,839,000
Prefunded deductible policy
Malpractice Insurance [Line Items]
Insurance policy coverage limits per claim	500,000
Other Insurance
Insurance policy coverage limits per claim	500,000
Professional liability insurance, annual coverage limit per facility	3,000,000
Liability for reported claims and estimates for incurred but unreported claims	1,488,000
SHC Risk Carriers, Inc | Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Insurance policy coverage limits per claim	500,000
Malpractice insurance annual sublimit per center	1,000,000
Aggregate policy limit	5,000,000
Other Insurance
Insurance policy coverage limits per claim	500,000
Unaffiliated entities | Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Insurance policy coverage limits per claim	1,000,000
Malpractice insurance annual sublimit per center	$ 3,000,000
Number of types of professional liability insurance policies | policy	7
Other Insurance
Insurance policy coverage limits per claim	$ 1,000,000
Scheduled for trial or arbitration over next 12 months
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	10