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Summary Of Significant Accounting Policies (Schedule Of Capitalized Software Included In Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Summary Of Significant Accounting Policies [Abstract]
Capitalized software development costs	$ 69,879	$ 66,108
Accumulated amortization	(52,061)	(47,770)
Net capitalized software development costs	$ 17,818	$ 18,338

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.