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Share-based Payments (Tables)
 3 Months Ended
Jun. 30, 2021
Share-based Payments [Abstract]  
Stock Option Transactions
The following is a summary of stock option transactions:

 
  
Number of
Shares
    
Weighted Average
Exercise Price
  
Outstanding at March 31, 2021
    
1,744,885
    
$
17.51
  
Granted
    
-
    
$
-
  
Exercised
    
(21,270
)
  
$
18.24
  
Forfeited
    
(900
)
  
$
17.90
  
Outstanding at June 30, 2021
    
1,722,715
    
$
17.50
  
Restricted Stock Units Activity
The following is a summary of non-vested RSUs:

 
  
Number of
Shares
    
Weighted Average
Grant Date Fair
Value
  
Outstanding at March 31, 2021
    
354,484
    
$
17.22
  
Granted
    
218,673
    
$
22.27
  
Vested
    
(59,483
)
  
$
16.62
  
Forfeited
    
-
    
$
-
  
Outstanding at June 30, 2021
    
513,674
    
$
19.44
  
Monte Carlo Valuation Model Assumptions Used In Determining The Fair Value Of The TSR Awards
The following table summarizes the assumptions used in determining the fair value of the TSR awards:

  
Three Months Ended
June 30,
  
 
  
2021
  
Risk free interest rate
    
0.47
%
Expected life in years
    
3
  
Expected volatility of MPA common stock
    
53.70
%
Expected average volatility of peer companies
    
59.30
%
Average correlation coefficient of peer companies
    
26.70
%
Expected dividend yield
    
-
  
Grant date fair value
  
$
26.89
  
Perfomance Stock Units Activity
The following is a summary of non-vested PSUs:

 
  
Number of
Shares
    
Weighted Average
Grant Date Fair
Value
  
Outstanding at March 31, 2021
    
-
    
$
-
  
Granted
    
84,593
    
$
23.19
  
Vested
    
-
    
$
-
  
Forfeited
    
-
    
$
-
  
Outstanding at June 30, 2021
    
84,593
    
$
23.19