Commitments and Contingencies (Narrative) (Details)	6 Months Ended
	Jun. 30, 2017 USD ($) lawsuit facility policy	Jun. 30, 2016 USD ($)	Oct. 31, 2014 facility
Malpractice Insurance [Line Items]
Number of professional liability lawsuits | lawsuit	74
Cash expenditures for self-insured professional liability costs	$ 4,338,000	$ 1,542,000
Other Insurance
Liability for workers compensation claims	957,000
Workers compensation insurance, non current receivable for excess premiums paid	$ 1,628,000
Unfavorable regulatory action | Potential violations of false claims act
Malpractice Insurance [Line Items]
Number of facilities | facility	6		2
Professional malpractice liability insurance
Malpractice Insurance [Line Items]
Liability for reported and estimated future claims	$ 19,384,000
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
Health insurance, maximum self-insured annual amount per individual	175,000
Liability for reported claims and estimates for incurred but unreported claims	1,272,000
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	17