Financial Instruments (Summary Of Financial Instruments Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 1,019	$ 1,642
Contingent consideration	(1,951)	(1,912)
Total liabilities	(1,951)	(1,912)
Net assets (liabilities)	(932)	(270)
Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	716	1,319
Restricted securities	303	323
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,019	1,642
Net assets (liabilities)	1,019	1,642
Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	716	1,319
Restricted securities	303	323
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	(1,951)	(1,912)
Total liabilities	(1,951)	(1,912)
Net assets (liabilities)	$ (1,951)	$ (1,912)