Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015		2014		2013
Numerator:
Net income available to common stockholders	$	585	$	540	$	387
Denominator:
Denominator for basic earnings per share—weighted-average common shares	95,170		97,489		93,436
Effect of dilutive securities:
Employee stock options and warrants	300		394		504
4 percent Convertible Senior Notes	660		6,386		11,769
Restricted stock units	249		687		582
Denominator for diluted earnings per share—adjusted weighted-average common shares	96,379		104,956		106,291
Basic earnings per share	$	6.14	$	5.54	$	4.14
Diluted earnings per share	$	6.07	$	5.15	$	3.64