Cash Equivalents And Restricted Cash And Securities (Narrative ) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Money Market Funds [Member]	Dec. 31, 2011 Money Market Funds [Member]	Sep. 30, 2012 Maturity Date Between Three Months And One Year [Member]	Dec. 31, 2011 No Maturity Date [Member]	Dec. 31, 2011 Maturity Date Within Three Months [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term restricted securities			$ 324,000	$ 312,000
Long-term restricted cash and securities	5,000,000
Long-term restricted securities				5,000,000
Gains or losses realized on cash equivalents	0	0
Restricted securities					$ 324,000	$ 5,000,000	$ 312,000