Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Concentration of Net Operating Revenues by Payor

We derived consolidated Net operating revenues from the following payor sources:



	For the Year Ended December 31,
	2013		2012		2011
Medicare	74.5	%	73.4	%	72.0	%
Medicaid	1.2	%	1.2	%	1.6	%
Workers' compensation	1.2	%	1.5	%	1.6	%
Managed care and other discount plans, including Medicare Advantage	18.5	%	19.3	%	19.8	%
Other third-party payors	1.8	%	1.8	%	2.0	%
Patients	1.1	%	1.3	%	1.2	%
Other income	1.7	%	1.5	%	1.8	%
Total	100.0	%	100.0	%	100.0	%

Concentration of Net Patient Service Accounts Receivable by Payor Class

The concentration of net patient service accounts receivable by payor class, as a percentage of total net patient service accounts receivable, is as follows:



	As of December 31,
	2013		2012
Medicare	67.4	%	62.8	%
Medicaid	2.0	%	2.1	%
Workers' compensation	2.6	%	3.0	%
Managed care and other discount plans, including Medicare Advantage	22.4	%	25.8	%
Other third-party payors	4.0	%	4.3	%
Patients	1.6	%	2.0	%
Total	100.0	%	100.0	%

Useful Lives of Property and Equipment

Useful lives are generally as follows:



	Years
Buildings	10 to 30
Leasehold improvements	2 to 15
Furniture, fixtures, and equipment	3 to 10
Assets under capital lease obligations:
Real estate	15 to 20
Equipment	3 to 5

Estimated Useful Lives and Amortization Basis of Other Intangible Assets

The range of estimated useful lives and the amortization basis for our other intangible assets are generally as follows:



	Estimated Useful Life and Amortization Basis
Certificates of need	10 to 30 years using straight-line basis
Licenses	10 to 20 years using straight-line basis
Noncompete agreements	3 to 18 years using straight-line basis
Tradenames	10 to 20 years using straight-line basis
Internal-use software	3 to 7 years using straight-line basis
Market access assets	20 years using accelerated basis