Earnings Per Share

12 Months Ended

Dec. 31, 2017

Basic earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Diluted earnings per share is computed by dividing net income available to common stockholders by the weighted-average number of common shares plus the effect of dilutive potential common shares outstanding during the period. Net income and earnings per share for 2017 include the significant impact of the enactment of the Tax Cuts and Jobs Act discussed further in note 13 to the consolidated financial statements. The following table sets forth the computation of basic and diluted earnings per share (shares in thousands):



	Year Ended December 31,
	2017		2016		2015
Numerator:
Net income available to common stockholders	$	1,346	$	566	$	585
Denominator:
Denominator for basic earnings per share—weighted-average common shares	84,599		87,217		95,170
Effect of dilutive securities:
Employee stock options and warrants	403		277		300
4 percent Convertible Senior Notes	—		—		660
Restricted stock units	560		281		249
Denominator for diluted earnings per share—adjusted weighted-average common shares	85,562		87,775		96,379
Basic earnings per share	$	15.91	$	6.49	$	6.14
Diluted earnings per share	$	15.73	$	6.45	$	6.07