Basis Of Presentation And Significant Accounting Policies Percentage Of Customers (Details)	6 Months Ended
Jun. 30, 2012
Percentage of sales to customers of oil and gas revenues	39
Percentage of sales to customers of oil and gas revenues,	37
Percentage of sales to customers of oil and gas revenues.	22

Percentage of sales to customers of oil and gas revenues,

No definition available.

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