Earnings per Share (EPS)

The following table reconciles the net income and the weighted average common shares outstanding used in the computations of basic and diluted earnings per common share:



	Three Months Ended September 30,				Nine Months Ended September 30,
(In thousands, except per share amounts)	2018		2017		2018		2017
Net income	$	116,011	$	78,393	$	338,835	$	217,109
Less: dividends declared	—		—		—		—
Net income available to common shareholders	$	116,011	$	78,393	$	338,835	$	217,109
Basic earnings per share	$	1.19	$	0.83	$	3.48	$	2.35
Diluted earnings per share	$	1.18	$	0.82	$	3.46	$	2.31
Basic weighted average shares outstanding	97,438		94,185		97,388		92,285
Dilutive effect of nonvested shares	575		1,909		556		1,819
Diluted weighted average shares outstanding	98,013		96,094		97,944		94,104

There were 11,445 and 956 antidilutive shares for the three months ended September 30, 2018 and 2017, respectively and 164,874 and 59,534 antidilutive shares for the nine months ended September 30, 2018 and 2017, respectively.

The nonvested performance-based share awards are considered contingently issuable for purposes of the EPS calculation. Based on the compounded annual book value per share growth as of September 30, 2018 and 2017, 100% of the dilutive performance-based share awards would be issuable under the terms of the arrangements at each date if September 30 was the end of the contingency period.