Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of earnings per share

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