CONVERTIBLE NOTES (Schedule Of Debt Interest Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss on extinguishment	$ 0	$ 0	$ 1,325
Change in fair value of convertible note embedded derivative	0	0	(38,061)
Notes 2021 [Member]
Contractual interest expense	4,344	4,359	4,434
Debt discount amortization	2,991	2,587	2,309
Change in fair value of convertible note embedded derivative			38,061
Interest payment in connection with conversions		234	3,918
Loss (income) in connection with conversions		245	(1,643)
Total	$ 7,335	$ 7,425	47,079
Notes 2022 [Member]
Contractual interest expense			55
Debt discount amortization			(46)
Loss on extinguishment			1,325
Total			$ 1,334