	Year Ended December 31,
	2020								2019						2018
	Net Loss			Shares		Per Share Amount			Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount
	(In thousands, except per share amounts)
Basic (loss) earnings per share	$	(312,321	)		78,194	$	(3.99	)	$	89,476		80,309	$	1.11	$	44,788		86,170	$	0.52
Effect of dilutive incentive-based awards					—							735						740
Diluted (loss) earnings per share	$	(312,321	)		78,194	$	(3.99	)	$	89,476		81,044	$	1.10	$	44,788		86,910	$	0.52

In accordance with the Earnings Per Share Topic of the ASC, basic (loss) earnings per share is computed by dividing net (loss) income by the weighted average number of shares of common stock outstanding during the period (excluding treasury stock and unvested restricted stock awards). Unvested restricted stock awards are eligible to receive dividends, if any; however, dividend rights will be forfeited if the award does not vest. Accordingly, only vested shares of formerly restricted stock are included in the calculation of basic (loss) earnings per share. The weighted average number of repurchased shares during the period, if any, which are held as treasury stock, are excluded from shares of common stock outstanding.

Diluted (loss) earnings per share is determined using the treasury stock method based on the dilutive effect of certain unvested restricted stock awards and certain shares of common stock that are issuable upon exercise of stock options. During the year ended December 31, 2020, there were approximately 2,253,000 potentially dilutive shares of common stock excluded from the computation of diluted loss per share as their effect would have been anti-dilutive due to the Company’s net loss in the period. During the years ended December 31, 2019 and 2018, there were approximately 305,000 and 1,299,000 anti-dilutive shares of common stock excluded from the computation of diluted earnings per share, respectively.

The Company’s outstanding performance-vesting restricted stock awards are considered contingently issuable shares and are excluded from the calculation of diluted earnings per share until the performance measure criteria is met as of the end of the reporting period. For the years ended December 31, 2019 and 2018, approximately 247,000 and 364,000 performance-vesting restricted stock awards had met their performance criteria for their respective performance years as of the end of the reporting periods, respectively, and are therefore included in the calculation of diluted earnings per share. See further discussion in Note 19–Equity-Based Compensation.