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Share-based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of options, fully vested and exercisable
A summary of activity under our Stock Incentive Plan during the year ended December 31, 2019 is presented below:
Options
 
Number
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (years)
 
Aggregate Intrinsic Value
Outstanding at January 1, 2019
 
117,110

 
$
6.55

 
 
 
 
Exercised
 
(40,049
)
 
6.55

 

 

Forfeited/expired
 
(77,061
)
 
6.55

 

 

Outstanding, fully vested and exercisable at December 31, 2019 (1)
 

 
$

 

 
$

(1) 
As the result of actions in 2011 that were determined to be a "change of control" under the Stock Incentive Plan, all options remained exercisable for their respective remaining term, regardless of whether the awardees remained employees of Century. There are no outstanding stock options as of December 31, 2019.
Summary of service-based share awards activity
Service-based share awards
 
Number
Outstanding at January 1, 2019
 
658,906

Granted
 
613,043

Vested
 
(288,530
)
Forfeited
 
(62,001
)
Outstanding at December 31, 2019
 
921,418

 
 
 
Performance-based share awards
 
Number
Outstanding at January 1, 2019
 
608,301

Granted
 
571,369

Vested
 
(302,342
)
Forfeited
 
(33,265
)
Outstanding at December 31, 2019
 
844,063

 
Year ended December 31,
Service-based share awards
2019
 
2018
 
2017
Weighted average per share fair value of service-based share grants
$
11.34

 
$
20.21

 
$
8.92

Total intrinsic value of option exercises
39

 
444

 
624


Summary of share-based compensation expense
The following table summarizes the compensation cost recognized for the years ended December 31, 2019, 2018 and 2017 for all options, service-based and performance-based share awards. The compensation cost is included as part of selling, general and administrative expenses in our Consolidated Statements of Operations.
 
Year ended December 31,
 
2019
 
2018
 
2017
Share-based compensation expense reported:
 
 
 
 
 
Performance-based share expense
$
3.0

 
$
(0.1
)
 
$
4.0

Service-based share expense
3.5

 
3.8

 
3.4

Total share-based compensation expense before income tax
6.5

 
3.7

 
7.4

Income tax

 

 

Total share-based compensation expense, net of income tax
$
6.5

 
$
3.7

 
$
7.4