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STOCK PLANS AND SHARE-BASED COMPENSATION (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2014, and September 30, 2013 (in thousands).
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2014

2013
 
2014
 
2013
Cost of revenues
$
131

 
$
296

 
$
648

 
$
824

Research and development
971

 
1,485

 
3,522

 
4,231

Sales and marketing
779

 
964

 
2,578

 
2,588

General and administrative
699

 
1,446

 
3,922

 
4,512

Total stock-based compensation expense
$
2,580

 
$
4,191

 
$
10,670

 
$
12,155
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 September 30, 2014.
 
September 30, 2014
 
Unrecognized
Compensation
Expense for Unvested
Awards
 
Weighted Average
Remaining
Recognition
Period
 
(In thousands)
 
(In years)
Options
 
$
999

 
 
1.30
Performance-based awards
 
164

 
 
0.25
Long-term performance-based awards
 
1,076

 
 
2.25
Restricted stock units
 
22,349

 
 
2.51
Purchase plan
 
570

 
 
0.50
Total unrecognized compensation expense
 
$
25,158

 
 
 
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
Nine Months Ended
 
September 30,
September 30,
 
2014

2013
2014

2013
Risk-free interest rates
0.05%

0.08%
0.05% - 0.07%

0.08% - 0.11%
Expected volatility rates
48%

37%
30% - 48%

33% - 37%
Expected dividend yield
0.85%

0.62%
0.66% - 0.85%

0.62% - 0.80%
Expected term of purchase right (in years)
0.5

0.5
0.5

0.5
Weighted-average estimated fair value of purchase rights
$15.25

$13.87
$14.40

$11.01
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 September 30, 2014, and changes during the nine 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
(308
)
 
$28.63
 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at September 30, 2014
1,383

 
$27.05
 
3.74
 
$
37,150

Exercisable at September 30, 2014
1,318

 
$26.36
 
3.56
 
$
36,309

Vested and expected to vest at September 30, 2014
1,381

 
$27.03
 
3.73
 
$
37,120
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 September 30, 2014, and activity during the nine 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 September 30, 2014
83

 
$53.93
 
0.25
 
$
4,501

Outstanding and expected to vest at September 30, 2014
5

 
 
 
0.25
 
$
270
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 September 30, 2014, and activity during the nine 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 September 30, 2014
56

 
$56.15
 
2.25
 
$
3,014

Outstanding and expected to vest at September 30, 2014
49

 
 
 
2.25
 
$
2,653
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 September 30, 2014, and changes during the nine 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
262

 
$51.30
 
 
 
 
Vested
(259
)
 
$38.54
 
 
 
 
Forfeited or expired
(19
)
 
$42.02
 
 
 
 
Outstanding at September 30, 2014
698

 
$43.67
 
1.51
 
$
37,633

Outstanding and expected to vest at September 30, 2014
642

 
 
 
1.45
 
$
34,598