	Year Ended December 31,
	2021						2020								2019
	Net Income		Shares		Per Share Amount		Net Loss			Shares		Per Share Amount			Net Income		Shares		Per Share Amount
	(In thousands, except per share amounts)
Basic earnings (loss) per share	$	256,513		78,302	$	3.28	$	(312,321	)		78,194	$	(3.99	)	$	89,476		80,309	$	1.11
Effect of dilutive incentive-based awards				1,273							—							735
Diluted earnings (loss) per share	$	256,513		79,575	$	3.22	$	(312,321	)		78,194	$	(3.99	)	$	89,476		81,044	$	1.10

In accordance with ASC 260, Earnings Per Share, basic earnings (loss) per share is computed by dividing net income (loss) 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 earnings (loss) 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 earnings (loss) 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 years ended December 31, 2021 and 2019, there were approximately 146,000 and 305,000 anti-dilutive shares of common stock excluded from the computation of diluted earnings per share, respectively. 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.

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, 2021 and 2019, approximately 352,000 and 247,000 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.