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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

A summary of the Company’s stock option activity is as follows:

	Shares			Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Options outstanding as of December 31, 2019		1,058,652		$	21.82
Granted		250,432			12.37
Exercised		(11,250	)		9.27
Forfeited		(220,714	)		16.44
Cancelled		(9,240	)		14.78
Options outstanding as of December 31, 2020		1,067,880		$	20.91	$	0.1

Options exercisable as of December 31, 2020		844,952		$	21.94	$	—

The fair value of each option grant was estimated at the date of grant using the following assumptions:

A summary of activity for restricted stock units is as follows:

	Shares			Weighted Average Grant Date Fair Value Per Share
Unvested as of December 31, 2019		290,563		$	22.55
Granted		333,269			11.64
Vested		(177,307	)		21.66
Forfeited		(84,232	)		14.27
Unvested as of December 31, 2020		362,293		$	14.87

The fair value of each total shareholder return performance share unit was estimated at the date of grant using the following assumptions:

A summary of activity for performance share units is as follows:

	Shares			Weighted Average Grant Date Fair Value Per Share
Unvested as of December 31, 2019		457,583		$	26.25
Granted		328,310			12.67
Vested		(97,135	)		26.11
Forfeited		(330,423	)		21.05
Unvested as of December 31, 2020		358,335		$	18.64