CONVERTIBLE NOTES (Schedule of Interest Expense Recognized) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Contractual interest expense	$ 3,105	$ 3,105	$ 888
Amortization of debt issuance costs and debt discount	444	444	127
Total	$ 3,549	$ 3,549	$ 1,015