Summary Of Significant Accounting Policies (Schedule Of Percentage Of Company's Total Revenues) (Details)

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Summary Of Significant Accounting Policies (Schedule Of Percentage Of Company's Total Revenues) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Georgia [Member]
Percentage of revenues under contracts or subcontracts		13.00%	17.00%
Ohio [Member]
Percentage of revenues under contracts or subcontracts		10.00%	13.00%
Texas [Member]
Percentage of revenues under contracts or subcontracts	36.00%	26.00%	30.00%