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Employee Stock Benefit Plans Employee Stock Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Assumptions used to value options
The fair value for these options was estimated at the date of grant using a Black-Scholes option-pricing model. The company did not grant options in 2019 and 2018. The assumptions used to value options in 2017 is as follows:
 
 
2017
Risk-free interest rate
1.95-2.18%

Expected stock price volatility
46.19-47.59%

Dividend yield
0.00
%
Expected life (in years)
6.25
Payout schedule For the market-based restricted performance stock units issued during the year ended December 31, 2019 and 2018, the payouts at vesting which are linearly interpolated between the percentiles specified below are as follows:
Payout Schedule
Percentile Ranking
 
% of Target Earned
Greater than

 
80%
 
 
 
200%
50
%
—
80%
 
100
%
—
200%
30
%
—
50%
 
50
%
—
100%
Less than

 
30%
 
—
%
 
—%
Assumptions made on restricted performance stock units
The assumptions used to value these market based restricted performance stock units are as follows:
 
2019
 
2018
 
2017
Risk-free interest rate
2.40
%
 
2.38
%
 
1.54
%
Expected stock price volatility
39.95
%
 
36.72
%
 
35.99
%
Dividend yield
0.00
%
 
0.00
%
 
0.00
%
Expected term (in years)
2.79

 
2.79

 
2.79
Summary of stock incentive plans
Our stock incentive plans as of December 31, 2019 are summarized as follows (in thousands): 
 
Shares
Authorized
 
Shares
Available
for Grant
 
Stock
Options
Outstanding
 
Non-vested Restricted Stock and Restricted Stock Units
Options assumed from acquisition
2,227

 
296

 
219

 


2006 Incentive Plan
71,669

 

 
3,650

 
34

2015 Incentive Plan
42,731

 
23,145

 
1,077

 
10,355

Total as of December 31, 2019
116,627

 
23,441

 
4,946

 
10,389
Summary of stock option activities
The following table summarizes the activity and changes related to stock options during the year:
  
Stock Options Outstanding
  
Units
 
Weighted Average Exercise Price Per Unit
 
(in thousands)
 
 
Outstanding at December 31, 2018
5,935

 
$
3.79

Stock options granted
—

 
—

Stock options exercised
(948
)
 
2.62

Stock options canceled
(41
)
 
4.04

Outstanding at December 31, 2019
4,946

 
$
4.01

Exercisable at December 31, 2019
4,425

 
$
3.73
Summary of restricted stock and restricted stock unit activities
The following table summarizes the activity and changes related to restricted stock and restricted stock units during the year:
  
Restricted Stock and Restricted Stock Units Outstanding
  
Units
 
Weighted Average Grant Date Fair Market Value Per Unit
 
(in thousands)
 
 
Non-vested at December 31, 2018
9,906

 
$
8.81

Restricted stock and restricted stock units granted
7,696

 
11.29

Restricted stock and restricted stock units vested
(4,917
)
 
6.69

Restricted stock and restricted stock units canceled
(2,296
)
 
10.31

Non-vested at December 31, 2019
10,389

 
$
10.58
Information regarding options outstanding by exercise price range Information regarding the options outstanding as of December 31, 2019 is summarized below: 
  
Stock Options Outstanding
 
Stock Options Exercisable
Range of
Exercise Prices
Stock
Options
Outstanding
Weighted
Average
Remaining
Contractual
Life
Weighted Average Exercise Price
Aggregate
Intrinsic
Value
 
Stock Options Vested and Exercisable
Weighted Average Remaining Contractual Life
Weighted Average Exercise Price
Aggregate
Intrinsic
Value
 
(in thousands)
(in years)
 
(in thousands)
 
(in thousands)
(in years)
 
(in thousands)
$0.69 to $1.99
268

 
1.22

 
 
264

 
1.22

 
$2.00 to $4.00
3,337

 
3.41

 
 
3,337

 
3.41

 
$4.01 to $7.25
1,341

 
6.06

 
 
824

 
5.83

 
 
4,946

5.13
4.01

$
16,804

 
4,425

4.87
3.73

$
16,281