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SHARE-BASED COMPENSATION (Tables)
3 Months Ended
Mar. 31, 2018
Schedule of Share-based Compensation Activity
Share-based compensation activity in first quarter 2018 included the following:
SHARES IN THOUSANDS
Granted
 
Vested
Restricted Stock Units (RSUs)
673

 
576

Performance Share Units (PSUs)
344

 
110

Weighted Average Assumptions Used in Estimating the Value of Performance Share Units Granted
Weighted Average Assumptions Used in Estimating the Value of Performance Share Units Granted in 2018
 
Performance Share Units
Performance period
1/1/2018

12/31/2020
Valuation date average stock price(1)
 
 
$34.14
Expected dividends
 
 
3.81%
Risk-free rate
1.75
%
2.34%
Expected volatility
17.30
%
21.52%

(1) Calculated as an average of the high and low prices on grant date.