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SHARE-BASED PAYMENTS SHARE-BASED PAYMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2020646,287 $63.85 
Granted417,212 $46.84 
Released to participants(242,765)$51.57 
Forfeited(40,797)$55.27 
Nonvested December 31, 2021779,937 $59.02 
 202120202019
Weighted-average grant date fair value (per share)$46.84 $76.49 $58.07 
Fair value of units granted (thousands of dollars)$19,542 $16,552 $15,238 
Grant date fair value of units vested (thousands of dollars)$12,519 $11,204 $10,691 
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, 2020834,246 $75.96 
Granted542,183 $62.03 
Released to participants(311,907)$64.00 
Forfeited(87,937)$68.37 
Nonvested December 31, 2021976,585 $72.73 
 202120202019
Volatility (a)60.30%21.70%27.10%
Dividend yield8.13%4.87%5.05%
Risk-free interest rate0.21%1.39%2.47%
(a) - Volatility was based on historical volatility over three years using daily stock price observations.
 202120202019
Weighted-average grant date fair value (per share)$62.03 $88.43 $68.02 
Fair value of units granted (thousands of dollars)$33,632 $25,028 $23,020 
Grant date fair value of units vested (thousands of dollars)$19,962 $17,722 $15,018