NET INCOME (LOSS) PER SHARE (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Calculation of basic and diluted net income (loss) per share

The following table sets forth the calculation of basic and diluted net income (loss) per share (in thousands except per share data):

	Year Ended December 31,
	2013		2014		2015
Numerator:
Net income (loss)	$	29,734	$	44,869	$	(3,465	)
Denominator:
Denominator for basic net income (loss) per share — weighted-average outstanding shares	27,670		30,215		31,950
Effect of dilutive securities:
Stock options and restricted stock	542		426		—
Denominator for diluted net income (loss) per share — weighted-average outstanding shares	28,212		30,641		31,950
Net income (loss) per share — basic	$	1.07	$	1.48	$	(0.11	)
Net income (loss) per share — diluted	$	1.05	$	1.46	$	(0.11	)

Schedule of anti-dilutive securities excluded from computation of earnings per share

The following table summarizes the shares underlying the performance-based restricted stock awards and service-based restricted stock units excluded from the basic and diluted calculation (in thousands):

	Year Ended December 31,
	2013	2014	2015
Performance-based restricted stock awards	379	23	55
Service-based restricted stock units	—	1	1
Total shares excluded from computation	379	24	56