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Stock Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Stock Options, Activity
The following tables provide additional information related to the options:
2018 Activity
Number of shares
(in thousands)
 
Weighted average exercise price
 
Remaining weighted average contractual life in years
 
Intrinsic value
(in millions)
Beginning balance
5,817

 
$
12.66

 
4.6
 
$

Granted
505

 
$
12.00

 
 
 
 
Exercised
(35
)
 
$
7.11

 
 
 
 
Forfeited/expired
(547
)
 
$
15.22

 
 
 
 
Total outstanding
5,740

 
$
12.39

 
3.7
 
$

Options exercisable
4,850

 
$
12.25

 
3.0
 
$

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The assumptions used in the Black-Scholes pricing model to estimate the fair value of the options granted in 2018, 2017 and 2016 are as follows:
 
2018
 
2017
 
2016
Weighted average fair value
$5.62
 
$8.95
 
$3.85
Assumptions
 
 
 
 
 
Expected life (in years)
6.25
 
6.25
 
6.25
Volatility
44%
 
43%
 
40%
Dividend yield
—%
 
—%
 
—%
Risk free interest rate
2.74%
 
2.11%
 
1.40%
Nonvested Restricted Stock Shares Activity
Restricted stock generally vests over a three or four year period from the date of grant. The following table provides additional information related to our restricted stock:
2018 Activity
Restricted stock (shares in thousands)
Nonvested at beginning of year
292

Granted
63

Vested
(124
)
Forfeited
(36
)
Nonvested at the end of year
195

The following table provides additional information related to our restricted stock units:
2018 Activity
Restricted stock units (shares in thousands)

Nonvested at beginning of year
2,226

Granted
1,507

Vested
(856
)
Forfeited
(422
)
Nonvested at the end of year
2,455