Net Income Per Share (Notes)

3 Months Ended

Mar. 31, 2018

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,
	2018		2017
Net income - basic and diluted	$	477,980	$	248,931

(Shares in thousands)
Weighted average shares - basic	107,648		105,572
Effect of dilutive securities:
Stock options	7,244		9,050
Restricted stock	14		484
Dilutive potential shares	7,258		9,534
Weighted average shares - diluted	114,906		115,106

Net income per share - basic	$	4.44	$	2.36
Net income per share - diluted	$	4.16	$	2.16

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)

Stock options

Restricted stock