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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of stock option award activity
The following is a summary of stock option award activity for 2018:
 
Shares
(in thousands)
 
Weighted Average
Exercise Price
Per Share
 
Weighted Average
Remaining
Contractual Life
(in years)
 
Aggregate
Intrinsic
Value
(in thousands)
 
 
 
 
 
 
 
 
Outstanding - December 31, 2017
16

 
$
15.30

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
—

 
—

 
 
 
 
Canceled
—

 
—

 
 
 
 
Outstanding - December 31, 2018
16

 
$
15.30

 
2.5
 
$
1,220

Exercisable - December 31, 2018
16

 
$
15.30

 
2.5
 
$
1,220
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 2018:
 
Shares
(in thousands)
 
Weighted Average
Grant Date Fair
Value
 
 
 
 
Non-vested - December 31, 2017
343

 
$
35.29

Granted
290

 
65.98

Vested
(14
)
 
66.28

Canceled/Forfeited
(37
)
 
41.37

Non-vested - December 31, 2018
582

 
$
49.48
Long-Term Incentive Program Awards [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 2018:
 
Number of
Performance
Units
(in thousands)
 
Weighted Average
Grant Date Fair
Value
 
 
 
 
Unvested at December 31, 2017
570

 
$
32.90

Granted
100

 
81.51

Vested
(196
)
 
26.40

Canceled
(48
)
 
41.90

Unvested at December 31, 2018
426

 
$
46.35