Loans Receivable From Independent Contractors (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012 item	Dec. 31, 2011
Independent Contractor Operations [Line Items]
Independent contractors with sublicenses	66
Maximum exposure to loss from arrangements with independent contractors	$ 1.3	$ 1.1
Percentage of labor sales	40.00%
Minimum [Member]
Independent Contractor Operations [Line Items]
Terms of the loans to independent contractors	2 months 15 days
Interest rates on loans	0.00%
Maximum [Member]
Independent Contractor Operations [Line Items]
Terms of the loans to independent contractors	5 years 4 months 24 days
Interest rates on loans	8.00%

The estimated maximum amount of possible loss from the contingency.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

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

-Publisher FASB

-Name FASB Interpretation (FIN)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

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