CONVERTIBLE NOTES (Schedule Of Debt Interest Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loss (gain) on extinguishment		$ 1,325	$ (14,063)
Change in fair value of convertible note embedded derivative		(38,061)	(6,473)
Notes 2021 [Member]
Contractual interest expense	$ 4,359	4,434	313
Debt discount amortization	2,587	2,309	147
Loss (gain) on extinguishment			(14,063)
Change in fair value of convertible note embedded derivative		38,061	6,473
Interest payment in connection with conversions	234	3,918
Income in connection with conversions	245	(1,643)
Total	$ 7,425	47,079	$ (7,130)
Notes 2022 [Member]
Contractual interest expense		55
Debt discount amortization		(46)
Loss (gain) on extinguishment		1,325
Total		$ 1,334