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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables)
12 Months Ended
Dec. 31, 2020
Restricted Stock Units Activity  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Activity The following tables set forth activity and various statistics for our restricted stock unit awards:
Number of
Units
Weighted
Average Price
Nonvested December 31, 2019698,990 $54.05 
Granted216,392 $76.49 
Released to participants(240,576)$46.58 
Forfeited(28,519)$65.20 
Nonvested December 31, 2020646,287 $63.85 
 202020192018
Weighted-average grant date fair value (per share)$76.49 $58.07 $46.94 
Fair value of units granted (thousands of dollars)$16,552 $15,238 $13,907 
Grant date fair value of units vested (thousands of dollars)$11,204 $10,691 $9,552 
Performance-Unit Activity  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Activity The following tables set forth activity and various statistics related to the performance unit awards and the assumptions used in the valuations at the respective grant dates:
Number of
Units
Weighted
Average Price
Nonvested December 31, 2019937,821 $66.67 
Granted283,029 $88.43 
Released to participants(300,423)$58.99 
Forfeited(86,181)$74.83 
Nonvested December 31, 2020834,246 $75.96 
 202020192018
Volatility (a)21.70%27.10%39.20%
Dividend yield4.87%5.05%5.49%
Risk-free interest rate1.39%2.47%2.44%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.
 202020192018
Weighted-average grant date fair value (per share)$88.43 $68.02 $59.57 
Fair value of units granted (thousands of dollars)$25,028 $23,020 $22,081 
Grant date fair value of units vested (thousands of dollars)$17,722 $15,018 $12,545