Financial Instruments (Summary Of Financial Instruments Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 1,105	$ 12,646
Contingent consideration	(1,902)
Total liabilities	(1,902)
Net assets (liabilities)	(797)
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	781	7,334
Restricted securities	324	5,312
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,105	12,646
Net assets (liabilities)	1,105
Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	781	7,334
Restricted securities	324	5,312
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	(1,902)
Total liabilities	(1,902)
Net assets (liabilities)	$ (1,902)