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Share-based compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of activity of stock options
The following table summarizes the activity of stock options during fiscal years 2019, 2018 and 2017:
 
 
Units
 
Weighted-average strike price
 
Weighted-average grant-date fair value
Outstanding at December 31, 2016
 
776,475

 
15.55

 
4.46

Expired (i)
 
(141,986
)
 
21.20

 
5.28

Outstanding at December 31, 2017
 
634,489

 
14.28

 
4.28

Expired (i)
 
(143,416
)
 
21.20

 
5.89

Outstanding at December 31, 2018
 
491,073

 
12.26

 
3.81

Expired (i)
 
(216,633
)
 
14.35

 
5.13

Outstanding at December 31, 2019
 
274,440

 
10.62

 
2.77

Exercisable at December 31, 2019
 
274,440

 
10.62

 
2.77



(i)
As of December 31, 2019, 2018 and 2017, additional paid-in capital included $1,111, $844 and $750, respectively, related to expired stock options.

The following table provides a summary of outstanding stock options at December 31, 2019:  
 
 
Vested (i)
Number of units outstanding
 
274,440

Weighted-average grant-date fair market value per unit
 
2.77

Total grant-date fair value
 
760

Weighted-average accumulated percentage of service
 
100
%
Stock-based compensation recognized in Additional paid-in capital
 
760

 

(i)Related to exercisable awards.
Summary of activity of restricted share units
The following table summarizes the activity of restricted share units during fiscal years 2019, 2018 and 2017: 
 
 
Units
 
Weighted-average grant-date fair value
Outstanding at December 31, 2016
 
1,780,997

 
6.07

2017 annual grant
 
497,960

 
9.20

Partial vesting
 
(361,284
)
 
7.65

Forfeitures
 
(180,828
)
 
5.99

Outstanding at December 31, 2017
 
1,736,845

 
6.65

2018 annual grant
 
520,393

 
8.50

Partial vesting
 
(534,589
)
 
6.01

Forfeitures
 
(117,600
)
 
7.24

Outstanding at December 31, 2018
 
1,605,049

 
7.41

2019 annual grant
 
35,000

 
8.00

Partial vesting of 2014 grant
 
(38,222
)
 
8.58

Partial vesting of 2015 grant
 
(115,634
)
 
6.33

Partial vesting of 2016 grant
 
(134,501
)
 
4.70

Partial vesting of 2017 grant
 
(174,232
)
 
9.20

Forfeitures
 
(239,621
)
 
7.74

Outstanding at December 31, 2019
 
937,839

 
7.50

Exercisable at December 31, 2019
 
—

 
—
Summary of phantom RSU award activity
The following table summarizes the activity under the plan as of December 31, 2019:

 
 
Units
 
Grant 2019
 
1,672,657

 
 
Forfeited
 
(10,837
)
 
 
Outstanding at December 31, 2019
 
1,661,820

 
 

 
Total Non-vested (i)
Number of units outstanding
1,661,820

 
Current share price
8.10

 
Total fair value of the plan
13,461

 
Weighted-average accumulated percentage of service
15.62
%
 
Accrued liability (ii)
2,102

 
Compensation expense not yet recognized (iii)
11,359

 

(i)
Related to awards that will vest between May 2021 and May 2024.
(ii)
Presented within “Accrued payroll and other liabilities” in the Company’s non current liabilities balance sheet.
(iii)
Expected to be recognized in a weighted-average period of 3.97 years.