Insurance Matters (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Insurance Matters (Additional Textual) [Abstract]
Cash expenditures for self-insured professional liability costs	$ 3,065,000	$ 2,209,000
Net insurance recoveries assets and liabilities	500,000		750,000
Liability for workers compensation claims	368,000
Non-current receivables for workers' compensation policy	846,000
Health insurance for employees and dependents	175,000
Per center [Member]
Insurance Matters (Textual) [Abstract]
Maximum claim amount on insurance	3,000,000
Professional malpractice liability insurance [Member]
Insurance Matters (Textual) [Abstract]
Claim amount subject to be deductible	495,000
Liability for reported and estimated future claims	20,415,000
Professional malpractice liability insurance [Member] | Limit 1 [Member]
Insurance Matters (Textual) [Abstract]
Insurance policy coverage limits per claim	250,000
Maximum claim amount on insurance	750,000
Professional malpractice liability insurance [Member] | Limit 2 [Member]
Insurance Matters (Textual) [Abstract]
Insurance policy coverage limits per claim	1,000,000
Maximum claim amount on insurance	15,000,000
Prefunded deductible policy [Member]
Insurance Matters (Textual) [Abstract]
Insurance policy coverage limits per claim	500,000
Maximum claim amount on insurance	3,000,000
Liability for reported and estimated future claims	$ 721,000