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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Stock Activity
The following table summarizes restricted stock and restricted stock units activity:
 
Three Months Ended June 30, 2019
 
Six Months Ended June 30, 2019
 
Shares
 
Weighted — Average Grant-Date Fair Value per Share
 
Shares
 
Weighted — Average Grant-Date Fair Value per Share
Restricted Stock and Restricted Stock Units
 
 
 
 
 
 
 
Non-vested balance at beginning of period
1,632,382

 
$
27.20

 
1,620,568

 
$
27.27

Granted
264,228

 
32.15

 
325,107

 
31.87

Vested
(193,633
)
 
22.06

 
(224,997
)
 
23.79

Canceled and forfeited
(90,803
)
 
18.74

 
(108,504
)
 
20.93

Non-vested balance at end of period
1,612,174

 
$
29.11

 
1,612,174

 
$
29.11