Net Income Per Share

9 Months Ended

Sep. 30, 2013

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,
	2013		2012
Net income - basic	$	141,306	$	191,468
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	4,678		7,374
Net income - diluted	$	145,984	$	198,842
(Shares in thousands)
Weighted average shares - basic	98,226		95,012
Effect of dilutive securities:
Stock options	10,379		14,106
Restricted stock	462		797
Convertible senior notes	4,761		4,761
Warrants	2,885		1,154
Dilutive potential shares	18,487		20,818
Weighted average shares - diluted	116,713		115,830
Net income per share - basic	$	1.44	$	2.02
Net income per share - diluted	$	1.25	$	1.72

	Nine Months Ended
	September 30,
	2013		2012
Net income - basic	$	327,556	$	279,862
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	13,857
Net income - diluted	$	341,413	$	279,862
(Shares in thousands)
Weighted average shares - basic	97,602		94,349
Effect of dilutive securities:
Stock options	10,220		14,080
Restricted stock	415		699
Convertible senior notes	4,761
Warrants	2,556		652
Dilutive potential shares	17,952		15,431
Weighted average shares - diluted	115,554		109,780
Net income per share - basic	$	3.36	$	2.97
Net income per share - diluted	$	2.95	$	2.55

Shares which have been excluded from the September 30, 2013 and 2012 diluted per share amounts because their effect would have been antidilutive, include the following:

	Three Months Ended
	September 30,
(Shares in thousands)	2013	2012
Stock options	135	175

	Nine Months Ended
	September 30,
(Shares in thousands)	2013	2012
Stock options	1,265	91
Convertible senior notes		4,761