NET INCOME PER COMMON SHARE (Tables)

6 Months Ended

Jun. 30, 2014

Earnings Per Share [Abstract]

Computation of basic and diluted net income per common share

The following table sets forth the computation of basic and diluted net income per common share for the periods indicated (in thousands, except per share data): 

	Three Months Ended June 30,				Six Months Ended June 30,
	2014		2013		2014		2013
Net income	$	17,666	$	11,875	$	72,129	$	38,158
Weighted-average common shares outstanding - basic	65,820		75,531		66,450		75,590
Dilutive effect of employee stock-based awards	1,382		1,882		1,510		1,900
Number of shares used to compute net income per common    share - diluted	67,202		77,413		67,960		77,490
Net income per common share:
Basic	$	0.27	$	0.16	$	1.09	$	0.50
Diluted	$	0.26	$	0.15	$	1.06	$	0.49