Net Income Per Share (Notes)

3 Months Ended

Mar. 31, 2016

The Company's basic net income per share amounts have been computed by dividing net income by the weighted average number of shares of Common Stock and Class A Stock outstanding. Net income per share is presented on a combined basis, inclusive of Common Stock and Class A Stock outstanding, as each class of stock has equivalent economic rights. Diluted net income per share includes the potential dilutive effect of other securities as if such securities were converted or exercised during the period, when the effect is dilutive. The calculations of basic and diluted net income per share are as follows:



	Three Months Ended March 31,
	2016		2015
Net income - basic	$	165,736	$	76,021
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	56		—
Net income - diluted	$	165,792	$	76,021

(Shares in thousands)
Weighted average shares - basic	104,290		102,227
Effect of dilutive securities:
Stock options	8,147		9,313
Restricted stock	469		467
Convertible senior notes	44		—
Warrants	1,278		2,512
Dilutive potential shares	9,938		12,292
Weighted average shares - diluted	114,228		114,519

Net income per share - basic	$	1.59	$	0.74
Net income per share - diluted	$	1.45	$	0.66

Shares which have been excluded from diluted per share amounts because their effect would have been antidilutive include the following:



	Three Months Ended March 31,
(Shares in thousands)	2016	2015
Stock options	7,539	3,673
Restricted stock	19	—
Convertible senior notes	—	1,929