Commitments And Contingencies (Reconciliation Of Contingent Consideration Liability) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Commitments And Contingencies [Abstract]
Beginning balance	$ 11,519	$ 14,561
Payments	(875)	(354)
Accretion	392	481
Fair value adjustments	(148)	(259)
Total ending balance	10,888	14,429
Less current portion in accrued expenses and other current liabilities	(5,412)	(4,823)
Total long-term portion in other long-term liabilities	$ 5,476	$ 9,606