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Summary Of Significant Accounting Policies (Summary Of Activity Recorded Within The Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary Of Significant Accounting Policies [Abstract]
Beginning balance	$ 3,504	$ 3,677	$ 3,573
Bad debt expense	1,799	1,213	2,064
Reserves from acquisitions	896
Accounts written-off and other adjustments	(1,553)	(1,367)	(2,034)
Foreign currency translation	(32)	(19)	74
Ending balance	$ 4,614	$ 3,504	$ 3,677

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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