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Stock Compensation (Tables)
6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
A summary of stock option activity for the six months ended June 30, 2018 follows (shares in thousands):
 
 
Stock Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term 
(years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2017
 
1,758

 
$
26.35

 
 
 
 
Granted
 

 

 
 
 
 
Exercised
 

 

 
 
 
 
Forfeited and expired
 
(578
)
 
23.63

 
 
 
 
Outstanding at June 30, 2018
 
1,180

 
27.69

 
1.72
 
$

Expected to vest at June 30, 2018
 
12

 
13.48

 
4.31
 

Exercisable at June 30, 2018
 
1,168

 
27.83

 
1.69
 

Summary of Restricted Stock Unit Activity
A summary of restricted stock unit activity for the six months ended June 30, 2018 follows (shares in thousands):
 
 
Restricted
Stock
Units
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 2017
 
1,688

 
$
13.39

Granted
 
1,419

 
12.76

Vested
 
(750
)
 
13.47

Forfeited and expired
 
(91
)
 
12.57

Outstanding at June 30, 2018
 
2,266

 
13.03

Schedule of Assumptions Used
The fair value of awards with market conditions was estimated using a Monte Carlo simulation with the following weighted-average assumptions:
 
 
Six Months Ended
June 30, 2018
Weighted-average fair value of grant
 
$
15.84

Risk-free interest rate(i)
 
2.26
%
Expected volatility(ii)
 
52.97
%
Expected life of restricted stock units in years(iii)
 
2.88

Expected dividend yield
 
%
(i) 
Represents the continuously compounded semi-annual zero-coupon U.S. treasury rate commensurate with the remaining performance period
(ii) 
Based on historical volatility for the company that is commensurate with the length of the performance period
(iii) 
Represents the remaining life of the longest performance period