Convertible Senior Secured Notes (Schedule Of Principal Payments Of Secured Notes Payable) (Details) (USD $)	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2013	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012
Convertible Senior Secured Notes [Abstract]
Gross proceeds	$ 90,000,000	$ 90,000,000
Convertible note offering conversion option		(22,336,000)	(22,336,000)
Interest make-whole interest derivative		(9,270,000)	9,270,000
Amortization of debt discount		706,000	887,000	164,000
Carrying value		$ 59,100,000	$ 59,100,000