Cash Equivalents And Restricted Cash And Securities (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
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
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Short-term restricted securities	869,000		869,000		884,000
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
Maturity Date Within Three Months [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities					622,000
Maturity Date Between Three Months And One Year [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities	869,000		869,000		262,000
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
Minimum [Member] | Maturity Date Between Three Months And One Year [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities, period for maturity date			3 months		3 months
Maximum [Member] | Maturity Date Within Three Months [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities, period for maturity date					3 months
Maximum [Member] | Maturity Date Between Three Months And One Year [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted securities, period for maturity date			1 year		1 year