STOCK-BASED COMPENSATION (Details 2) - Options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Option Shares
Outstanding at the beginning of the period (in shares)	474	458	120
Granted (in shares)	265	138	120
Options previously granted, approved by shareholders			325
Exercised (in shares)	(127)	(89)	(43)
Forfeited (in shares)	(32)	(33)	(4)
Expired (in shares)	(2)	0	(60)
Outstanding at the end of the period (in shares)	578	474	458	120
Exercisable at the end of the period (in shares)	128
Vested or expected to vest at the end of the period (in shares)	567
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 29.40	$ 14.44	$ 50.35
Granted (in dollars per share)	45.60	62.07	31.59
Options previously granted, approved by shareholders (in dollars per share)			6.39
Exercised (in dollars per share)	11.79	9.24	19.45
Forfeited (in dollars per share)	47.84	11.81	6.36
Expired (in dollars per share)	139.32	0	73.96
Outstanding at the end of the period (in dollars per share)	39.28	29.40	14.44	$ 50.35
Exercisable at the end of the period (in dollars per share)	30.87
Vested or expected to vest at the end of the period (in dollars per share)	39.11
Weighted Average Grant-date Fair Value
Granted (in dollars per share)	$ 22.45	$ 30.08	$ 16.84
Weighted Average Remaining Term (Years)
Outstanding at the end of the period weighted average remaining term	8 years 2 months 12 days	8 years 2 months 12 days	8 years 8 months 12 days	2 years 4 months 24 days
Exercisable at the end of the period weighted average remaining term	7 years 1 month 6 days
Vested or expected to vest at the end of the period weighted average remaining term	8 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding at the beginning of the period intrinsic value (in dollars)	$ 10,136	$ 19,472	$ 81
Exercised at the end of the period intrinsic value (in dollars)	5,837	3,937	638
Outstanding at the end of the period intrinsic value (in dollars)	12,928	$ 10,136	$ 19,472	$ 81
Exercisable at the end of the period intrinsic value (in dollars)	4,033
Vested or expected to vest at the end of the period intrinsic value (in dollars)	$ 12,776