We have granted non-vested (restricted) stock awards (“restricted stock”) and restricted stock units (“RSUs”) to employees and officers pursuant to the 2011 Plan and the 2007 Plan. The restricted stock awards and RSUs have varying vesting periods, but generally become fully vested between two and four years after the grant date, depending on the specific award, performance targets met for performance based awards granted to officers, and vesting period for time based awards. Officer performance based awards are granted at the target amount of shares that may be earned and the actual amount of the award earned generally could range from 0% to 175% of the target number of shares based on the actual specified performance target met. We accounted for the restricted stock awards granted using the measurement and recognition provisions of ASC 718. Accordingly, the fair value of the restricted stock awards, including performance based awards, is measured on the grant date and recognized in earnings over the requisite service period for each separately vesting portion of the award.

The following table summarizes restricted stock award activity from September 30, 2019 through March 31, 2020:

	Shares/ Units			Weighted Average Grant Date Fair Value
Non-vested balance as of September 30, 2019		779,627		$	18.71
Changes during the period
Awards granted		418,771		$	16.53
Awards vested		(152,625	)	$	16.35
Awards forfeited		(7,150	)	$	18.96
Non-vested balance as of March 31, 2020		1,038,623

As of March 31, 2020, we had approximately $10.4 million of total unrecognized compensation cost, assuming applicable performance conditions are met, related to non-vested restricted stock awards. We expect to recognize that cost over a weighted average period of 2.4 years.