	For the Three Months Ended June 30,
	2019						2018
	Net Income		Shares		Per Share Amount		Net Income		Shares		Per Share Amount
	(In thousands, except per share amounts)
Basic earnings per share	$	52,651		81,520	$	0.65	$	22,697		86,399	$	0.26
Effect of dilutive incentive-based awards				647						486
Diluted earnings per share	$	52,651		82,167	$	0.64	$	22,697		86,885	$	0.26

	For the Six Months Ended June 30,
	2019						2018
	Net Income		Shares		Per Share Amount		Net Loss			Shares		Per Share Amount
	(In thousands, except per share amounts)
Basic earnings (loss) per share	$	15,631		82,432	$	0.19	$	(40,147	)		86,305	$	(0.47	)
Effect of dilutive incentive-based awards				784							—
Diluted earnings (loss) per share	$	15,631		83,216	$	0.19	$	(40,147	)		86,305	$	(0.47	)

In accordance with the Earnings Per Share Topic of the ASC, 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 unvested restricted stock awards and certain shares of common stock that are issuable upon exercise of stock options. During periods when the Company is in a net loss position, basic loss per share is the same as diluted loss per share as the effects of potentially dilutive securities are anti-dilutive due to the net loss. During the three and six months ended June 30, 2019, there were approximately 407,000 and 253,000 anti-dilutive shares of common stock excluded from the computation of diluted earnings per share, respectively, and approximately 2,023,000 during the three months ended June 30, 2018. During the six months ended June 30, 2018, there were approximately 3,882,000 potentially dilutive securities excluded from the computation of diluted loss per share due to the Company’s net loss in that period. The Company’s outstanding performance-vesting restricted awards of approximately 2,148,000 and 1,950,000 as of June 30, 2019 and 2018, respectively, are considered contingently issuable shares and are excluded from the calculation of diluted earnings (loss) per share until the performance measure criteria is met as of the end of the reporting period.