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STOCK PLANS AND SHARE BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock-based compensation expense [Table Text Block]
The following table summarizes the stock-based compensation expense recognized in accordance with ASC 718-10 for the years ended December 31, 2016, 2015 and 2014:
 
Year Ended December 31,
(in thousands)
2016
 
2015
 
2014
Cost of revenues
$
1,148

 
$
933

 
$
879

Research and development
7,309

 
5,255

 
4,784

Sales and marketing
4,489

 
3,644

 
3,540

General and administrative
7,939

 
4,935

 
5,079

Total stock-based compensation expense
$
20,885

 
$
14,767

 
$
14,282
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]
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 December 31, 2016:
 
Unrecognized Compensation
Expense for Unvested
Awards
(in thousands)
 
Weighted Average
Remaining Recognition
Period
(in years)
Long-term performance-based awards
$
2,562

 
1.52
Restricted stock units
21,930

 
2.27
Purchase plan
120

 
0.08
Total unrecognized compensation expense
$
24,612

 
 
Fair value assumptions for employees' stock purchase rights under the Purchase Plan [Table Text Block]
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 used during the three years ended December 31, 2016, 2015 and 2014:
 
Year Ended December 31,
 
2016
 
2015
 
2014
Risk-free interest rates
0.44%
 
0.13%
 
0.05% - 0.07%
Expected volatility rates
32%
 
29%
 
30% - 48%
Expected dividend yield
0.96%
 
1.08%
 
0.66% - 0.85%
Expected term of purchase right (in years)
0.5
 
0.5
 
0.5
Weighted-average estimated fair value of purchase rights
$12.23
 
$10.18
 
$14.40
Summary of option activity under the Plans [Table Text Block]
A summary of stock option activity under the Plans as of December 31, 2016, and activity during three years then ended, is presented below:
 (shares and intrinsic value in thousands)
Shares
 
Weighted
Average
Exercise
Price
 
Weighted Average
Remaining Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2014
1,691

 
$
27.34

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(347
)
 
$
27.64

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at December 31, 2014
1,344

 
$
27.27

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(311
)
 
$
26.11

 
 
 
 
Forfeited or expired
(3
)
 
$
37.97

 
 
 
 
Outstanding at December 31, 2015
1,030

 
$
27.58

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(333
)
 
$
25.41

 
 
 
 
Forfeited or expired
—

 
—

 
 
 
 
Outstanding at December 31, 2016
697

 
$
28.62

 
2.82
 
$
27,370

Exercisable at December 31, 2016
697

 
$
28.62

 
2.82
 
$
27,370

Vested and expected to vest at December 31, 2016
697

 
$
28.62

 
2.82
 
$
27,370
Summary of stock options outstanding by exercise price range [Table Text Block]
The following table summarizes the stock options outstanding at December 31, 2016:
 
 
Options Outstanding
 
Options Exercisable
(shares in thousands)

Range of Exercise Prices
 
Options Outstanding
 
Weighted Average
Remaining Contractual Term
(in years)
 
Weighted Average Exercise Price
 
Options Exercisable
 
Weighted Average Exercise Price
$17.75 - $25.25
 
371

 
2.15
 
$
21.31

 
371

 
$
21.31

$25.48 - $42.88
 
326

 
3.58
 
$
36.94

 
326

 
$
36.94

 
 
697

 
2.82
 
$
28.62

 
697

 
$
28.62
Summary of restricted stock units outstanding [Table Text Block]
A summary of RSUs outstanding as of December 31, 2016, and activity during the three years then ended, is as follows:
 
(shares and intrinsic value in thousands)
Shares
 
Weighted Average Grant Date Fair Value Per Share
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
Outstanding at January 1, 2014
714

 
$
38.97

 
 
 
 
Granted
281

 
$
51.12

 
 
 
 
Vested
(267
)
 
$
38.57

 
 
 
 
Forfeited
(36
)
 
$
42.74

 
 
 
 
Outstanding at December 31, 2014
692

 
$
43.86

 
 
 
 
Granted
319

 
$
49.75

 
 
 
 
Vested
(267
)
 
$
42.49

 
 
 
 
Forfeited
(63
)
 
$
45.71

 
 
 
 
Outstanding at December 31, 2015
681

 
$
46.98

 
 
 
 
Granted
331

 
$
46.70

 
 
 
 
Vested
(270
)
 
$
45.13

 
 
 
 
Forfeited
(24
)
 
$
47.21

 
 
 
 
Outstanding at December 31, 2016
718

 
$
47.54

 
1.25
 
$
48,684

Outstanding and expected to vest at December 31, 2016
674

 
 
 
1.19
 
$
45,711
Performance Based Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of performance-based awards outstanding [Table Text Block]
A summary of PSU awards outstanding as of December 31, 2016, and activity during the three years then ended is presented below:
(shares and intrinsic value in thousands)
Shares
 
Weighted Average Grant Date Fair Value Per Share
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic
Value
Outstanding at January 1, 2014
100

 
$
38.48

 
 
 
 
Granted
83

 
$
53.93

 
 
 
 
Vested
(83
)
 
$
38.48

 
 
 
 
Forfeited or canceled
(100
)
 
$
51.30

 
 
 
 
Outstanding at December 31, 2014
—

 
—

 
 
 
 
Granted
89

 
$
52.36

 
 
 
 
Vested
—

 
—

 
 
 
 
Forfeited or canceled
(78
)
 
$
52.35

 
 
 
 
Outstanding at December 31, 2015
11

 
$
52.35

 
 
 
 
Granted
101

 
$
46.26

 
 
 
 
Vested
(11
)
 
$
52.35

 
 
 
 
Forfeited or canceled
(2
)
 
$
46.87

 
 
 
 
Outstanding at December 31, 2016
99

 
$
46.25

 
0
 
$
6,714

Outstanding and expected to vest at December 31, 2016
99

 
 
 
0
 
$
6,714
Long-Term Performance-based Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of performance-based awards outstanding [Table Text Block]
A summary of PRSU awards outstanding as of December 31, 2016, and activity during the three years then ended is presented below:
(shares and intrinsic value in thousands)
Shares
 
Weighted Average Grant Date Fair Value Per Share
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
Outstanding at January 1, 2014
—

 
—

 
 
 
 
Granted
61

 
$
55.51

 
 
 
 
Vested
—

 
—

 
 
 
 
Forfeited or canceled
—

 
—

 
 
 
 
Outstanding at December 31, 2014
61

 
$
55.51

 
 
 
 
Granted
72

 
$
52.47

 
 
 
 
Vested
—

 
—

 
 
 
 
Forfeited or canceled
(4
)
 
$
57.76

 
 
 
 
Outstanding at December 31, 2015
129

 
$
53.75

 
 
 
 
Granted
78

 
$
43.26

 
 
 
 
Vested
—

 
—

 
 
 
 
Forfeited or canceled
(57
)
 
$
55.35

 
 
 
 
Outstanding at December 31, 2016
150

 
$
47.65

 
1.52
 
$
10,177

Outstanding and expected to vest at December 31, 2016
113

 

 
1.51
 
$
7,659