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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Vested and Unvested Restricted Stock Units Outstanding
The following table summarizes information about vested and unvested restricted stock units, excluding cash-settled EBI units discussed above, outstanding at September 30, 2019 and 2018:
 
 
 
Nine Months Ended September 30,
 
 
 
2019
 
 
2018
 
 
 
Restricted Stock
Units
Outstanding

 
Weighted
Average Grant
Date
Fair Value

 
Restricted Stock
Units
Outstanding

 
Weighted
Average Grant
Date
Fair Value

Balance at beginning of period
 
1,140,215

 
$
21.96

 
1,214,325

 
$
19.97

Grants
 
167,343

 
34.05

 
117,459

 
40.20

Released and distributed (vested)
 
(270,959
)
 
24.00

 
(205,565
)
 
21.93

Forfeited/expired
 
(11,727
)
 
24.56

 
(10,035
)
 
23.66

Balance at end of period
 
1,024,872

 
$
23.67

 
1,116,184

 
$
21.86