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Stock Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Stock Unit Activity
A summary of restricted stock unit activity for the nine months ended September 30, 2019 follows (shares in thousands):
 
 
Restricted
Stock
Units
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 2018
 
2,151

 
$
12.90

Granted
 
1,319

 
15.04

Vested
 
(1,121
)
 
13.24

Forfeited and expired
 
(274
)
 
13.78

Outstanding at September 30, 2019
 
2,075

 
14.17
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:
 
Nine Months Ended
September 30,
 
2019
 
2018
Weighted-average fair value of grant
$
16.58

 
$
15.20

Risk-free interest rate(i)
2.49
%
 
2.26
%
Expected volatility(ii)
47.91
%
 
52.97
%
Expected life of restricted stock units in years(iii)
2.87

 
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