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Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
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 2017:
 
 
Shares
 
Weighted Average Exercise Price Per Share
 
Weighted Average Remaining Contractual Life
 
Aggregate Intrinsic Value
 
 
(in thousands)
 
 
 
(in years)
 
(in thousands)
Outstanding - December 31, 2016
 
16

 
$
15.30

 
 
 
 
Granted
 
—

 
—

 
 
 
 
Exercised
 
—

 
—

 
 
 
 
Canceled
 
—

 
—

 
 
 
 
Outstanding - December 31, 2017
 
16

 
$
15.30

 
3.5
 
$
657

Exercisable - December 31, 2017
 
16

 
$
15.30

 
3.5
 
$
657
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 2017:
 
 
Shares
 
Weighted Average Grant Date Fair Value
 
 
(in thousands)
 
 
Non-vested - December 31, 2016
 
1,006

 
$
23.09

Granted
 
323

 
42.15

Vested
 
(952
)
 
24.87

Canceled/Forfeited
 
(34
)
 
31.24

Non-vested - December 31, 2017
 
343

 
$
35.29
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 for 2017:
 
 
Number of Performance Units at Target
 
Weighted Average Grant Date Fair Value
 
Maximum Shares Eligible to Receive
 
 
(in thousands)
 
 
 
(in thousands)
Unvested at December 31, 2016
 
463

 
$
28.02

 
844

Granted
 
195

 
41.55

 
332

Vested
 
—

 
—

 
—

Canceled
 
—

 
—

 
—

Unvested at December 31, 2017
 
658

 
$
32.03

 
1,176

 
 
 
 
 
 
 
Expected to vest
 
926