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Share-based compensation
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based compensation
13. Share-based compensation
The following table provides the total share-based compensation expense included in general and administrative expenses during the three and six months ended June 30, 2019 and 2018:
 
Three months ended
 
Six months ended
 
June 30,
2019
 
June 30,
2018
 
June 30,
2019
 
June 30,
2018
Management and director options
$
—

 
$
60

 
$
—

 
$
155

Restricted shares with service condition
940

 
139

 
1,134

 
279

Restricted shares with service and performance condition
3,014

 
1,114

 
4,278

 
2,124

 
$
3,954

 
$
1,313

 
$
5,412

 
$
2,558


As of June 30, 2019, the Company had $10.3 million (December 31, 2018 - $7.4 million) of unamortized share compensation expense, which is expected to be amortized over a weighted average period of 1.6 years (December 31, 2018 - 1.4 years).
Management and director options
The Company has not granted any stock option awards since April 2013. These stock option awards were fully amortized as of December 31, 2018.
The following table summarizes information about the Company’s management and director share options outstanding and exercisable as of June 30, 2019:
Range of exercise prices
Number of
options
 
Weighted average
exercise price
 
Remaining contractual life
$10.00 - $10.89
5,123,531

 
$
10.04

 
2.6 years
$15.05 - $16.89
1,917,145

 
15.93

 
2.8 years
$20.00 - $25.05
1,847,377

 
20.26

 
2.7 years
 
8,888,053

 
$
13.43

 
2.7 years

Restricted shares with service condition
Restricted share award activity for the six months ended June 30, 2019 and year ended December 31, 2018 was as follows:
 
Number of non-
vested restricted
shares
 
Weighted
average grant
date fair value
Balance as of January 1, 2018
18,209

 
$
12.15

Granted
50,644

 
13.45

Vested
(44,788
)
 
12.97

Balance as of January 1, 2019
24,065

 
13.35

Granted
391,221

 
11.34

Forfeited
(19,625
)
 
11.21

Vested
(24,064
)
 
13.35

Balance as of June 30, 2019
371,597

 
$
11.13


Restricted shares with service condition vest either ratably or at the end of the required service period and contain certain restrictions during the vesting period, relating to, among other things, forfeiture in the event of termination of employment or service and transferability.
Restricted shares with service and performance condition
Restricted share award activity for the restricted shares with a service and performance condition for the six months ended June 30, 2019 and year ended December 31, 2018 were as follows:
 
Number of non-
vested restricted
shares
 
Number of non-
vested restricted
shares probable of vesting
 
Weighted average grant date fair value of shares probable of vesting
Balance as of January 1, 2018
1,855,379

 
887,203

 
$
12.60

Granted
556,403

 
370,931

 
14.01

Forfeited
(294,977
)
 
(4,102
)
 
13.98

Vested
(115,757
)
 
(115,757
)
 
14.00

Change in estimated restricted shares considered probable of vesting
n/a

 
46,945

 
13.35

Balance as of January 1, 2019
2,001,048

 
1,185,220

 
12.80

Granted
781,789

 
521,193

 
11.21

Forfeited
(791,629
)
 
(264,224
)
 
11.75

Vested
(148,718
)
 
(148,718
)
 
11.40

Change in estimated restricted shares considered probable of vesting
 n/a

 
112,198

 
13.19

Balance as of June 30, 2019
1,842,490

 
1,405,669

 
$
12.60