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STOCK PLANS AND SHARE-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-based Compensation Expense
The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the three and six months ended June 30, 2014, and June 30, 2013 (in thousands).
 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2014

2013
 
2014
 
2013
Cost of revenues
$
298

 
$
264

 
$
517

 
$
528

Research and development
1,339

 
1,640

 
2,551

 
2,746

Sales and marketing
864

 
795

 
1,799

 
1,624

General and administrative
1,674

 
1,629

 
3,223

 
3,066

Total stock-based compensation expense
$
4,175

 
$
4,328

 
$
8,090

 
$
7,964
Schedule of Unrecognized Compensation Expense for Unvested Awards
The following table summarizes total compensation expense related to unvested awards not yet recognized, net of expected forfeitures, and the weighted-average period over which it is expected to be recognized as of June 30, 2014.
 
June 30, 2014
 
Unrecognized
Compensation
Expense for Unvested
Awards
 
Weighted Average
Remaining
Recognition
Period
 
(In thousands)
 
(In years)
Options
 
$
1,215

 
 
1.51
Performance-based awards
 
1,948

 
 
0.50
Long term performance-based awards
 
1,961

 
 
2.50
Restricted stock units
 
24,534

 
 
2.76
Purchase plan
 
101

 
 
0.50
Total unrecognized compensation expense
 
$
29,759

 
 
 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
The fair value of employees’ stock purchase rights under the Purchase Plan was estimated using the Black-Scholes model with the following weighted-average assumptions:        

*Three Months Ended
Six Months Ended
 
June 30,
June 30,
 
2014

2013
2014

2013
Risk-free interest rates
—%

—%
0.07%

0.11%
Expected volatility rates
—%

—%
30%

33%
Expected dividend yield
—%

—%
0.66%

0.80%
Expected term of purchase right (in years)
0

0
0.5

0.5
Weighted-average estimated fair value of purchase rights
$—

$—
$13.31

$9.14
Summary of Option Activity Under the Plans
A summary of stock option activity under the Plans, excluding performance-based awards and restricted stock units, as of June 30, 2014, and changes during the six months then ended is presented below:
 
Shares
(in thousands)
 
Weighted-
Average
Exercise
Price
 
Weighted-Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2014
1,691

 
$27.34
 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(256
)
 
$29.80
 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at June 30, 2014
1,435

 
$26.90
 
3.92
 
$
43,966

Exercisable at June 30, 2014
1,352

 
$26.05
 
3.69
 
$
42,579

Vested and expected to vest at June 30, 2014
1,432

 
$26.87
 
3.91
 
$
43,912
Performance Based Awards (PSUs) [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of performance-based awards outstanding as of June 30, 2014, and activity during the six months then ended, is presented below:
 
Shares
(in thousands)
 
Weighted- Average Grant Date Fair Value Per Share
 
Weighted-Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
(in thousands)
Outstanding at January 1, 2014
100

 
$38.48
 
 
 
 
Granted
83

 
$53.93
 
 
 
 
Vested
(83
)
 
$38.48
 
 
 
 
Change in units due to performance achievement for PSUs vested in the year
(17
)
 
$38.48
 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at June 30, 2014
83

 
$53.93
 
0.50
 
$
4,804

Outstanding and expected to vest at June 30, 2014
48

 
 
 
0.50
 
$
2,787
Long-Term Performance-based Awards (PRSUs) [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of long-term performance-based awards outstanding as of June 30, 2014, and activity during the six months then ended, is presented below:
 
Shares
(in thousands)
 
Weighted- Average Grant Date Fair Value Per Share
 
Weighted-Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
(in thousands)
Outstanding at January 1, 2014
—

 
—

 
 
 
 
Granted
56

 
$56.15
 
 
 
 
Vested
—

 
—

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at June 30, 2014
56

 
$56.15
 
2.50
 
$
3,216

Outstanding and expected to vest at June 30, 2014
49

 
 
 
2.50
 
$
2,792
Restricted Stock Units (RSUs) [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of RSUs outstanding as of June 30, 2014, and changes during the six months then ended, are as follows: 
 
Shares
(in thousands)
 
Weighted- Average Grant Date Fair Value Per Share
 
Weighted-Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
(in thousands)
Outstanding at January 1, 2014
714

 
$38.97
 
 
 
 
Granted
250

 
$50.97
 
 
 
 
Vested
(246
)
 
$38.54
 
 
 
 
Forfeited or expired
(12
)
 
$39.99
 
 
 
 
Outstanding at June 30, 2014
706

 
$43.35
 
1.73
 
$
40,599

Outstanding and expected to vest at June 30, 2014
641

 
 
 
1.67
 
$
36,860