Cash Equivalents And Restricted Cash And Securities (Narrative ) (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Long-term restricted cash and securities	$ 5,000,000		$ 5,000,000
Gains or losses realized on cash equivalents	0	0
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term restricted securities	303,000		323,000
Maturity Date Between Three Months And One Year [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	303,000
Maturity Date Within Three Months [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities			323,000
No Maturity Date [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	$ 5,000,000		$ 5,000,000