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Share-based compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Restricted Share Awards
A summary of our restricted share awards from January 1, 2018 to June 30, 2018 is as follows:
 
Number of Shares
 
Weighted-Average Grant Date Fair Value
Unvested balance at January 1, 2018
1,265,830

 
$
10.19

Granted
486,884

 
10.78

Vested
(181,296
)
 
10.34

Forfeited
(22,735
)
 
10.20

Unvested balance at June 30, 2018
1,548,683

 
$
10.36
Summary of Key Inputs Used in Monte-Carlo Simulation
The table below summarizes the key inputs used in the Monte-Carlo simulation ($ in thousands):
Performance Award Grant Date
 
Percentage of Total Award
 
Grant Date Fair Value by Component
 
Volatility (1)
 
Interest
Rate (2)
 
Dividend Yield
May 26, 2017
 
 
 
 
 
 
 
 
 
 
Total Shareholder Return
 
50
%
 
$
770

 
27.02
%
 
1.39
%
 
—
%
Adjusted EBITDA Comparison
 
50
%
 
$
1,350

 
—
%
 
—
%
 
—
%
January 2, 2018
 
 
 
 
 
 
 
 
 
 
Total Shareholder Return
 
50
%
 
$
860

 
26.13
%
 
2.00
%
 
—
%
Adjusted EBITDA Comparison
 
50
%
 
$
1,475

 
—
%
 
—
%
 
—
%
________
(1) Expected volatility was determined based on the historical share prices in our industry.
(2) The risk-free rate was based on U.S. Treasury zero coupon issues with a remaining term equal to the remaining term of the measurement period.