NET INCOME PER SHARE - Tabular Disclosure (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings per share - basic
Net income	$ 2,365	$ 13,759
Undistributed earnings allocated to participating securities	(9)
Net income attributable to common stockholders - basic	$ 2,356	$ 13,759
Weighted average shares used in computing net income per share attributable to common stockholders - basic	151,282	135,331
Net income per share attributable to common stockholders - basic	$ 0.02	$ 0.10
Earnings per share - diluted
Net income attributable to common stockholders - diluted	$ 2,356	$ 13,759
Weighted average shares used in computing net income per share attributable to common stockholders - basic	151,282	135,331
Effect of dilutive securities	1,073	3,571
Weighted average shares used in computing diluted net income per share attributable to common stockholders - diluted	152,355	138,902
Net income per share attributable to common stockholders-diluted	$ 0.02	$ 0.10