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Revenue Recognition	9 Months Ended
Sep. 30, 2011
Revenue Recognition
Revenue Recognition	(3) Revenue Recognition Center revenues consist of billing for the use of the centers' facilities (the “facility fee”) directly to the patient or third-party payor and, in limited instances, billing for anesthesia services. Such revenues are recognized when the related surgical procedures are performed. Revenues exclude any amounts billed for physicians' surgical services, which are billed separately by the physicians to the patient or third-party payor. Revenues from centers are recognized on the date of service, net of estimated contractual adjustments from third-party medical service payors including Medicare and Medicaid. During the nine months ended September 30, 2011 and 2010, the Company derived approximately 31% and 32%, respectively, of its revenues from governmental healthcare programs, primarily Medicare. Concentration of credit risk with respect to other payors is limited due to the large number of such payors.

Revenue Recognition

9 Months Ended

Sep. 30, 2011

(3) Revenue Recognition

Center revenues consist of billing for the use of the centers' facilities (the “facility fee”) directly to the patient or third-party payor and, in limited instances, billing for anesthesia services. Such revenues are recognized when the related surgical procedures are performed. Revenues exclude any amounts billed for physicians' surgical services, which are billed separately by the physicians to the patient or third-party payor.

Revenues from centers are recognized on the date of service, net of estimated contractual adjustments from third-party medical service payors including Medicare and Medicaid. During the nine months ended September 30, 2011 and 2010, the Company derived approximately 31% and 32%, respectively, of its revenues from governmental healthcare programs, primarily Medicare. Concentration of credit risk with respect to other payors is limited due to the large number of such payors.