Concentrations Of Risk (Schedule Of Major Customers, By Revenue Concentration) (Details)	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues as a Percent of Total	100.00%	100.00%	100.00%
Revenue From Top Ten Customers [Member]
Revenues as a Percent of Total	71.00%	72.00%	72.00%
Revenue From Top Ten Customers [Member] \| Direct TV [Member]
Revenues as a Percent of Total	23.00%	24.00%	30.00%
Revenue From Top Ten Customers [Member] \| AT&T [Member]
Revenues as a Percent of Total	23.00%	20.00%	16.00%
Revenue From Top Ten Customers [Member] \| El Paso Corporation [Member]
Revenues as a Percent of Total	8.00%

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

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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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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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