We adopted our 2017 Omnibus Incentive Plan (the “2017 Plan”) to attract and retain independent directors, executive officers and other key employees and service providers. As of September 30, 2020, there were 6,242,621 shares available for future grants under the 2017 Plan.

Restricted share awards consist of restricted shares and restricted share units that are granted to eligible employees, executives, and board members and consist of ordinary shares (or the right to receive ordinary shares).

A summary of our restricted share awards from January 1, 2020 to September 30, 2020 is as follows:


	Number of Shares	Weighted-Average Grant Date Fair Value
Unvested balance at January 1, 2020	2,157,336	$	9.03
Granted	1,076,619	7.92
Vested	(849,416)	8.98
Forfeited	(84,450)	8.89
Unvested balance at September 30, 2020	2,300,089	$	8.53

Performance share awards consist of ordinary shares that may become earned and vested based on the achievement of performance targets adopted by our Compensation Committee.

The table below summarizes the key inputs used in the Monte-Carlo simulation to determine the grant date fair value of the total shareholder return performance awards ($ in thousands):


Performance Award Grant Date	Percentage of Total Award		Grant Date Fair Value by Component		Volatility (1)		Interest Rate (2)		Dividend Yield
January 2, 2020
Total Shareholder Return	50	%	$	1,334	24.87	%	1.58	%	—	%
Adjusted EBITDA Comparison	50	%	$	2,187	—	%	—	%	—	%

(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.

A summary of our performance share awards from January 1, 2020 to September 30, 2020 is as follows:


	Number of Shares	Weighted-Average Grant Date Fair Value
Unvested balance at January 1, 2020	913,407	$	7.22
Granted	552,395	6.38
Forfeited	(265,088)	7.99
Unvested balance at September 30, 2020	1,200,714	$	6.66

On October 8, 2020, all unvested performance share awards were voluntarily waived by the award recipients and were cancelled.