Concentration Of Credit Risk (Narrative) (Details)	Dec. 31, 2011	Dec. 31, 2010
Concentration Of Credit Risk [Abstract]
Concentration risk percentage of revenue minimum	10.00%
Concentration risk percentage of accounts receivable	50.40%	50.50%
Accounts receivable number of customers	5	5

Concentration Risk Percentage Of Accounts Receivable

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant