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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
Additional disclosures for time-based RSAs and time-based RSUs:
Year Ended December 31,
202120202019
Weighted average grant date fair value of awards granted$88.84 $66.32 $124.04 
Fair value of awards vested during the year (in millions)
28.7 18.1 39.7 
Share-based Payment Arrangement, Cost by Plan
Stock-based compensation expense and other disclosures for stock-based awards follows:
Year Ended December 31,
(in thousands)202120202019
Stock-based compensation expense recognized$40,623 $60,145 $23,993 
Income tax benefit realized from stock-based compensation expense10,677 16,217 4,871 
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of time-based restricted stock awards and time-based restricted stock units activity
Following is a summary of time-based RSAs and time-based RSUs award activity for 2021:
Total Awards
(in thousands)
Weighted Average
Grant Date Fair
Value
Non-vested - December 31, 2020636 $78.04 
Granted430 88.84 
Vested(332)80.06 
Canceled(21)89.50 
Non-vested - December 31, 2021713 $82.61 
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of LTIP awards activity
The following is a summary of LTIP award activity, at 100% of targeted amount, for 2021:
Number of
Performance
Units
(in thousands)
Weighted Average
Grant Date Fair
Value
Unvested at December 31, 2020270 $89.40 
Granted83 96.05 
Vested(98)81.51 
Canceled(17)106.44 
Unvested at December 31, 2021238 $9,378.00