Basis of Presentation - Table 1 (Details)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basis of Presentation [Abstract]
Medicare	75.40%	74.90%
Medicare Advantage	7.80%	8.20%
Managed care	9.50%	10.00%
Medicaid	3.40%	2.60%
Other third-party payors	1.40%	1.50%
Workers’ compensation	0.90%	0.90%
Patients	0.50%	0.70%
Other income	1.10%	1.20%
Total	100.00%	100.00%