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Stock Compensation (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Stock Unit Activity
A summary of restricted stock unit activity for the six months ended June 30, 2020 follows (shares in thousands):
 
 
Restricted
Stock
Units
 
Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 2019
 
2,040

 
$
14.17

Granted
 
746

 
22.50

Vested
 
(910
)
 
13.86

Forfeited and expired
 
(89
)
 
15.58

Outstanding at June 30, 2020
 
1,787

 
17.75
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,
 
2020
 
2019
Weighted-average fair value of grant
$
28.33

 
$
16.58

Risk-free interest rate(i)
1.35
%
 
2.49
%
Expected volatility(ii)
51.81
%
 
47.91
%
Expected life of restricted stock units in years(iii)
2.86

 
2.87

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