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Stock Option And Grant Plan (Tables)
 12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary Of Stock Options
Information regarding stock option transactions is summarized below:
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
(options in thousands)
 
Options
 
Weighted
Average
Exercise
Price
 
Options
 
Weighted
Average
Exercise
Price
 
Options
 
Weighted
Average
Exercise
Price
Outstanding, beginning of year
 
7,545

 
$
35.10

 
7,319

 
$
29.92

 
8,110

 
$
22.94

Granted
 
1,109

 
$
67.53

 
1,104

 
$
58.50

 
1,204

 
$
48.35

Issued pursuant to Apache acquisition
 
—

 
$
—

 
418

 
$
18.66

 
—

 
$
—

Exercised
 
(1,464
)
 
$
21.85

 
(1,179
)
 
$
19.33

 
(1,924
)
 
$
11.92

Forfeited
 
(68
)
 
$
36.90

 
(117
)
 
$
33.27

 
(71
)
 
$
32.40

Outstanding, end of year
 
7,122

 
$
42.85

 
7,545

 
$
35.10

 
7,319

 
$
29.92

Vested and Exercisable, end of year
 
4,094

 
$
33.91

 
4,251

 
$
27.98

 
4,214

 
$
23.11

 
 
 
2012
 
2011
 
2010
Weighted Average Remaining Contractual Term (in years)
 
 
 
 
 
 
Outstanding
 
6.78

 
6.66

 
6.54

Vested and Exercisable
 
5.48

 
5.20

 
5.16

Aggregate Intrinsic Value (in thousands)
 
 
 
 
 
 
Outstanding
 
$
174,383

 
$
168,837

 
$
162,099

Vested and Exercisable
 
$
136,851

 
$
124,550

 
$
122,022
Stock-Based Compensation Expense
Total stock-based compensation expense recognized for the years ended December 31, 2012, 2011 and 2010 is as follows:
 
 
Year Ended December 31,
(in thousands, except per share amounts)
 
2012
 
2011
 
2010
Cost of sales:
 
 
 
 
 
 
Software licenses
 
$
1,478

 
$
556

 
$
135

Maintenance and service
 
2,232

 
1,897

 
1,541

Operating expenses:
 
 
 
 
 
 
Selling, general and administrative
 
15,278

 
12,501

 
11,755

Research and development
 
13,427

 
8,134

 
5,588

Stock-based compensation expense before taxes
 
32,415

 
23,088

 
19,019

Related income tax benefits
 
(8,509
)
 
(5,552
)
 
(4,254
)
Stock-based compensation expense, net of taxes
 
$
23,906

 
$
17,536

 
$
14,765

Net impact on earnings per share:
 
 
 
 
 
 
Basic earnings per share
 
$
(0.26
)
 
$
(0.19
)
 
$
(0.16
)
Diluted earnings per share
 
$
(0.25
)
 
$
(0.19
)
 
$
(0.16
)
Information Regarding Stock Options Outstanding
Information regarding stock options outstanding as of December 31, 2012 is summarized below:
(options in thousands)
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
 
Options
 
Weighted
Average
Remaining
Contractual
Life (years)
 
Weighted
Average
Exercise
Price
 
Options
 
Weighted
Average
Exercise
Price
$ 3.77 - $24.01
 
1,530

 
4.15
 
$
19.71

 
1,264

 
$
19.75

$ 25.32 - $40.87
 
1,425

 
5.16
 
$
33.36

 
1,406

 
$
33.34

$ 40.89 - $48.97
 
1,962

 
7.25
 
$
45.13

 
1,153

 
$
44.38

$ 51.52 - $67.34
 
1,139

 
8.67
 
$
58.69

 
271

 
$
58.43

$ 67.44 - $69.70
 
1,066

 
9.82
 
$
67.66

 
—

 
$
—
Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions To Estimate Fair Value Of Stock Awards
The table below presents the weighted average input assumptions used and resulting fair values for options granted or issued in business combinations during each respective year:
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
Risk-free interest rate
 
0.59% to 1.04%
 
0.91% to 2.11%
 
1.27% to 2.34%
Expected dividend yield
 
0%
 
0%
 
0%
Expected volatility
 
38%
 
39%
 
39%
Expected term
 
6.0 years
 
5.8 years
 
6.1 years
Weighted average fair value per share
 
$24.82
 
$25.84
 
$19.41
Restricted Stock Units (RSUs) [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Assumptions To Estimate Fair Value Of Stock Awards
 
Year Ended December 31,
Assumption used in Monte Carlo lattice pricing model
2012
 
2011 and 2010
Risk-free interest rate
0.16%
 
1.35%
Expected dividend yield
0%
 
0%
Expected volatility—ANSYS Stock Price
28%
 
40%
Expected volatility—NASDAQ Composite Index
20%
 
25%
Expected term
2.80
 
2.90
Correlation factor
0.75
 
0.70