Cash Equivalents And Restricted Cash And Securities (Narrative) (Details) (USD $)	3 Months Ended													3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Money Market Funds [Member]	Dec. 31, 2013 Money Market Funds [Member]	Mar. 31, 2014 No Maturity Date [Member]	Dec. 31, 2013 No Maturity Date [Member]	Mar. 31, 2014 Maturity Date Within Three Months [Member]	Dec. 31, 2013 Maturity Date Within Three Months [Member]	Mar. 31, 2014 Maturity Date Between Three Months And One Year [Member]	Dec. 31, 2013 Maturity Date Between Three Months And One Year [Member]	Mar. 31, 2014 GE Credit Agreement [Member]	Dec. 31, 2013 GE Credit Agreement [Member]	Mar. 31, 2014 Minimum [Member] Maturity Date Between Three Months And One Year [Member]	Dec. 31, 2013 Minimum [Member] Maturity Date Between Three Months And One Year [Member]	Mar. 31, 2014 Maximum [Member] Maturity Date Within Three Months [Member]	Dec. 31, 2013 Maximum [Member] Maturity Date Within Three Months [Member]	Mar. 31, 2014 Maximum [Member] Maturity Date Between Three Months And One Year [Member]	Dec. 31, 2013 Maximum [Member] Maturity Date Between Three Months And One Year [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term restricted securities				$ 684,000	$ 350,000
Short-term restricted cash and securities	5,684,000		5,350,000			5,000,000	5,000,000					5,000,000	5,000,000
Gains or losses realized on cash equivalents	0	0
Restricted securities								$ 20,000	$ 328,000	$ 664,000	$ 22,000
Restricted securities, period for maturity date														3 months	3 months	3 months	3 months	1 year	1 year