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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2017
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 months ended March 31, 2017, and March 31, 2016:
 
Three Months Ended
 
March 31,
(In thousands)
2017

2016
Cost of revenues
$
143

 
$
90

Research and development
1,634

 
1,469

Sales and marketing
1,097

 
1,027

General and administrative
2,095

 
1,830

Total stock-based compensation expense
$
4,969

 
$
4,416
Summary of Option Activity Under the Plans
A summary of stock options outstanding as of March 31, 2017, and activity during the three 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, 2017
697

 
$
28.62

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(51
)
 
$
34.13

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at March 31, 2017
646

 
$
28.17

 
2.51
 
$
24,268

Vested and exercisable at March 31, 2017
646

 
 
 
2.51
 
$
24,268
Performance Based Awards (PSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of PSUs outstanding as of March 31, 2017, and activity during the three 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, 2017
99

 
$
46.25

 
 
 
 
Granted
55

 
$
64.11

 
 
 
 
Vested
(99
)
 
$
46.25

 
 
 
 
Forfeited
—

 
—

 
 
 
 
Outstanding at March 31, 2017
55

 
$
64.11

 
0.75
 
$
3,616

Outstanding and expected to vest at March 31, 2017
46

 
 
 
0.75
 
$
3,020
Long-Term Performance-Based Awards (PRSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
A summary of PRSUs outstanding as of March 31, 2017, and activity during the three 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, 2017
150

 
$
47.65

 
 
 
 
Granted
71

 
$
63.00

 
 
 
 
Vested
—

 
—

 
 
 
 
Forfeited
(7
)
 
$
47.89

 
 
 
 
Outstanding at March 31, 2017
214

 
$
52.75

 
1.76
 
$
14,083

Outstanding and expected to vest at March 31, 2017
183

 
 
 
1.96
 
$
12,002
Restricted Stock Units (RSUs)  
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 March 31, 2017, and activity during the three 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, 2017
718

 
$
47.54

 
 
 
 
Granted
115

 
$
62.72

 
 
 
 
Vested
(110
)
 
$
45.14

 
 
 
 
Forfeited
(19
)
 
$
47.55

 
 
 
 
Outstanding at March 31, 2017
704

 
$
50.40

 
1.70
 
$
46,235

Outstanding and expected to vest at March 31, 2017
655

 
 
 
1.33
 
$
43,092