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Accounts Receivable And Net Patient Service Revenue (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts Receivable And Net Patient Service Revenue [Abstract]
Accounts receivable	$ 230,388				$ 181,395				$ 230,388	$ 181,395
Net patient service revenue	$ 404,898	$ 407,665	$ 393,402	$ 382,283	$ 368,480	$ 351,058	$ 349,094	$ 332,927	$ 1,588,248	$ 1,401,559	$ 1,288,264

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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Subparagraph a(1)

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 4

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of revenue recognized during the period for providing services to patients, primarily on an inpatient or outpatient basis and from office visits. For financial reporting purposes, patient service revenue is reflected net of provisions for contractual allowances (the amount needed to reduce the entity's gross billing rates to agreed-upon rates in contracts with third-party payers) and other adjustments. Significant revenue earned under capitation arrangements is reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-HCO

-Chapter 8

-Paragraph 10

-IssueDate 2006-05-01

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 954

-SubTopic 605

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6491461&loc=d3e8184-115640



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 954

-SubTopic 605

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6491461&loc=d3e8195-115640

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