Description of the Business and Summary of Significant Accounting Policies (Details 7) (Credit risk)	12 Months Ended
Dec. 31, 2011 entity	Dec. 31, 2011 Accounts receivable	Dec. 31, 2010 Accounts receivable
Concentration of credit risk
Number of institutions exposed to credit risk	1
Percentage of consolidated net accounts receivable from related party		5.00%	5.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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

-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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

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

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