ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income (loss) attributable to common stockholders	$ 23,044	$ (7,886)	$ 24,079	$ (9,397)
Denominator:
Denominator for basic net income (loss) per share - weighted average outstanding shares	45,128,341	46,681,585	45,946,820	47,487,607
Effect of dilutive securities:
Stock options and restricted stock	2,334,017	0	2,429,542	0
Denominator for diluted net income (loss) per share - weighted-average outstanding shares	47,462,358	46,681,585	48,376,362	47,487,607
Net income (loss) attributable to common stockholders per share – basic	$ 0.51	$ (0.17)	$ 0.52	$ (0.20)
Net income (loss) attributable to common stockholders per share – diluted	$ 0.49	$ (0.17)	$ 0.50	$ (0.20)