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Share-based compensation plans (Tables)
6 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of assumptions
During the six months ended June 30, 2015, the following awards were made under the 2009 share award and incentive plan on the following dates. Estimates of fair values of share options and deferred shares with and without performance criteria were made using the Black-Scholes options pricing model.
2009 share award and incentive plan
 
Class A common shares
 
Date granted
 
Vesting date
 
Purchase price
 
Expected share price volatility
 
Risk-free interest rate
 
Expected dividends per share
 
Expected life of awards
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Share options
 
48,319

 
June 19, 2015
 
June 19, 2019
 
$12.50
 
43%
 
1.59%
 
$—
 
5.5 years
Share options
 
48,319

 
June 19, 2015
 
June 19, 2018
 
$12.50
 
41%
 
1.59%
 
$—
 
4.5 years
Share options
 
48,319

 
June 19, 2015
 
June 19, 2017
 
$12.50
 
35%
 
0.99%
 
$—
 
3.5 years
Share options
 
48,319

 
June 19, 2015
 
June 19, 2016
 
$12.50
 
29%
 
0.65%
 
$—
 
2.5 years
Restricted shares without performance criteria
 
64,000

 
June 19, 2015
 
June 19, 2016
 
$0.01
 
27%
 
0.25%
 
$—
 
1 year
Restricted shares without performance criteria
 
36,000

 
June 19, 2015
 
June 19, 2018
 
$0.01
 
34%
 
0.99%
 
$—
 
3 years
Deferred shares without performance criteria
 
38,825

 
March 20, 2015
 
March 20, 2019
 
$0.01
 
43%
 
1.42%
 
$—
 
4 years
Deferred shares without performance criteria
 
38,825

 
March 20, 2015
 
March 20, 2018
 
$0.01
 
36%
 
0.95%
 
$—
 
3 years
Deferred shares without performance criteria
 
38,825

 
March 20, 2015
 
March 20, 2017
 
$0.01
 
31%
 
0.60%
 
$—
 
2 years
Deferred shares without performance criteria
 
38,825

 
March 20, 2015
 
March 20, 2016
 
$0.01
 
30%
 
0.24%
 
$—
 
1 year
Deferred shares with performance criteria
 
256,358

 
March 20, 2015
 
March 20, 2018
 
$0.01
 
36%
 
0.95%
 
$—
 
3 years