Cash Equivalents And Restricted Cash And Securities (Narrative ) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Restricted Cash and Cash Equivalents Items [Line Items]
Long-term restricted cash and securities	$ 5,000,000		$ 5,000,000		$ 5,000,000
Gains or losses realized on cash equivalents	0	0	0	0
Net unrealized holding loss	(2,000)		(2,000)
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term restricted securities	321,000		321,000		323,000
Maturity Date Between Three Months And One Year [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	321,000		321,000
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]
Long-term restricted cash and securities	5,000,000		5,000,000		5,000,000
GE Credit Agreement [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Long-term restricted cash and securities	$ 5,000,000		$ 5,000,000		$ 5,000,000