Computation Of Net Income (Loss) Per Share Of Common Stock (Narrative) (Details)	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2012 Stock Options And Restricted Stock Units [Member]	Sep. 30, 2012 Stock Options And Restricted Stock Units [Member]
Computation Of Net Income (Loss) Per Share Of Common Stocks [Line Items]
Equity instruments to acquire weighted average common shares excluded from the computation of diluted weighted average shares outstanding	1,226,000	1,155,000	1,737,000	1,757,000