Net Income Per Share (Notes)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Net Income Per Share

Net Income Per Share

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 September 30,
	2016		2015
Net income - basic	$	264,804	$	210,398
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	—		145
Net income - diluted	$	264,804	$	210,543
(Shares in thousands)
Weighted average shares - basic	104,833		103,348
Effect of dilutive securities:
Stock options	10,156		9,632
Restricted stock	479		481
Convertible senior notes	—		308
Warrants	998		2,175
Dilutive potential shares	11,633		12,596
Weighted average shares - diluted	116,466		115,944
Net income per share - basic	$	2.53	$	2.04
Net income per share - diluted	$	2.27	$	1.82

	Nine Months Ended September 30,
	2016		2015
Net income - basic	$	642,407	$	481,062
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	397		—
Net income - diluted	$	642,804	$	481,062
(Shares in thousands)
Weighted average shares - basic	104,586		102,825
Effect of dilutive securities:
Stock options	10,340		9,449
Restricted stock	474		475
Convertible senior notes	81		—
Warrants	1,086		2,395
Dilutive potential shares	11,981		12,319
Weighted average shares - diluted	116,567		115,144
Net income per share - basic	$	6.14	$	4.68
Net income per share - diluted	$	5.51	$	4.18

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

	Three Months Ended September 30,
(Shares in thousands)	2016	2015
Stock options	7,687	594
Restricted stock	19	—
Convertible senior notes	3	—

	Nine Months Ended September 30,
(Shares in thousands)	2016	2015
Stock options	7,842	3,388
Restricted stock	19	—
Convertible senior notes	—	1,253