Commitments and Contingencies (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Commitments and Contingencies [Abstract]
Level of risk retained by our captive insurance company (per claim)	$ 2.5
Total retention of risk assumed by captive insurance company	12.5
Accrual for professional indemnity insurance claims facilitated through our captive insurance company net of receivables from third party insurers	1.8	3.0
Receivables from third party insurers	$ 0.6	$ 0.9

The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date.

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 94-5

-Paragraph 11

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 18

-Article 12

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 3

-Subparagraph (a),(b),(c)

-URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant