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Income Taxes (Summary Of Deferred Tax Asset Valuation Allowances) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Taxes [Abstract]
Balance at the beginning of the year	$ 267	$ 0	$ 0
Additions	0	267	0
Subtractions	0	0	0
Balance at the end of the period	$ 267	$ 267	$ 0

The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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