Income Taxes (Summary Of Valuation Allowance) (Details) (Deferred Tax Valuation Allowance [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balances as of	$ 2,829	$ 1,779	$ 2,614
Cost charged to the tax provision		1,050	157
Write-offs	(216)		(992)
Balances as of	$ 2,613	$ 2,829	$ 1,779