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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of restricted stock awards activity
The following is a summary of restricted stock award activity for 2019:
 
Shares
(in thousands)
 
Weighted Average
Grant Date Fair
Value
 
 
 
 
Non-vested - December 31, 2018
582

 
$
49.48

Granted
200

 
124.04

Vested
(320
)
 
43.75

Canceled
(19
)
 
77.83

Non-vested - December 31, 2019
443

 
$
86.10
Performance Shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of restricted stock awards activity
The following is a summary of LTIP award activity, at 100% of targeted amount, for 2019:
 
Number of
Performance
Units
(in thousands)
 
Weighted Average
Grant Date Fair
Value
 
 
 
 
Unvested at December 31, 2018
426

 
$
46.35

Granted
59

 
139.71

Vested
(207
)
 
29.57

Canceled
(6
)
 
61.47

Unvested at December 31, 2019
272

 
$
79.95