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Allowance for Doubtful Accounts	6 Months Ended
Allowance for Doubtful Accounts	Jun. 30, 2011
Allowance for Doubtful Accounts [Abstract]
Allowance for Doubtful Accounts	5. Allowance for Doubtful Accounts The Company maintains an allowance for doubtful accounts at a level believed to be adequate to absorb estimated probable losses. That estimate is based on past loss experience, current economic and market conditions and other relevant factors.