Basis of Presentation - Table 1 (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basis of Presentation [Abstract]
Medicare	73.50%	74.10%	74.10%	74.50%
Medicaid	2.20%	1.50%	1.80%	1.20%
Workers’ compensation	1.10%	1.30%	1.20%	1.30%
Managed care and other discount plans, including Medicare Advantage	18.80%	18.70%	18.60%	18.50%
Other third-party payors	1.80%	1.70%	1.70%	1.70%
Patients	1.10%	1.10%	1.00%	1.10%
Other income	1.50%	1.60%	1.60%	1.70%
Total	100.00%	100.00%	100.00%	100.00%