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Share-based compensation (Tables) - 2011 Equity Incentive Plan
 12 Months Ended
Dec. 31, 2018
Stock Option  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Employee Compensation Equity Incentive Plan Activity (Stock Option)
The following table summarizes the activity of stock options during fiscal years 2018, 2017 and 2016:
 
 
Units
 
Weighted-average strike price
 
Weighted-average grant-date fair value
Outstanding at December 31, 2015
 
2,025,894

 
21.03

 
5.87

Forfeitures
 
(80,734
)
 
10.30

 
2.68

Expired (i)
 
(51,305
)
 
14.05

 
4.02

Modification (ii)
 
(1,117,380
)
 
19.07

 
5.30

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

Exercisable at December 31, 2018
 
455,719

 
12.55

 
3.95



(i)
As of December 31, 2018, 2017 and 2016, additional paid-in capital included $844, $750 and $206 respectively, related to expired stock options.
(ii)
Corresponds to stock options converted to a liability award.
Schedule Of Vested And Nonvested Unit Activity
The following table provides a summary of outstanding stock options at December 31, 2018:  

 
 
Vested (i)
 
Non-vested (ii)
 
Total
Number of units outstanding
 
455,719

 
35,354

 
491,073

Weighted-average grant-date fair market value per unit
 
3.95

 
1.98

 
3.81

Total grant-date fair value
 
1,800

 
70

 
1,870

Weighted-average accumulated percentage of service
 
100
%
 
92.9
%
 
99.7
%
Stock-based compensation recognized in Additional paid-in capital
 
1,800

 
65

 
1,865

Compensation expense not yet recognized (iii)
 
—

 
5

 
5

 

(i)Related to exercisable awards.
(ii)Related to awards that will vest in 2019.
(iii)Expected to be recognized in 4.5 months.
Restricted Share Units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Vested And Nonvested Unit Activity
The following table provides a summary of outstanding restricted share units at December 31, 2018: 

Number of units outstanding (i) 
1,605,049

Weighted-average grant-date fair market value per unit
7.41

Total grant-date fair value 
11,900

Weighted-average accumulated percentage of service
51.70
%
Stock-based compensation recognized in Additional paid-in capital
6,157

Compensation expense not yet recognized (ii)
5,743


(i)
Related to awards that will vest between fiscal years 2019 and 2023.
(ii)
Expected to be recognized in a weighted-average period of 2.0 years.
Schedule Of Restricted Share Units Activity
The following table summarizes the activity of restricted share units during fiscal years 2018, 2017 and 2016: 
 
 
Units
 
Weighted-average grant-date fair value
Outstanding at December 31, 2015
 
1,230,210

 
7.96

2016 annual grant
 
865,291

 
4.70

Partial vesting
 
(172,328
)
 
12.25

Forfeitures
 
(142,176
)
 
6.64

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

Exercisable at December 31, 2018
 
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