Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Commitments And Contingencies [Abstract]
Balance at December 31, 2011	$ 14,561
Acquisitions	67
Payments	(3,253)	(226)
Accretion	1,324
Fair value adjustments	(63)
Balance at September 30, 2012	12,636
Less current portion in accrued expenses and other current liabilities	5,667
Total long-term portion in other long-term liabilities	$ 6,969