Net Income (Loss) Per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Net Income (Loss) 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:

	December 31,
	2014		2013		2012
Net income - basic	$	348,074	$	424,362	$	750,269
Effect of dilutive securities:
Convertible senior notes - interest expense related to contractual coupon interest rate and amortization of discount and note issuance costs	—		—		29,126
Net income - diluted	$	348,074	$	424,362	$	779,395
(Shares in thousands)
Weighted average shares - basic	100,612		97,917		94,685
Effect of dilutive securities:
Stock options	9,440		10,233		14,231
Restricted stock	425		433		715
Convertible senior notes	—		—		4,761
Warrants	2,936		2,707		990
Dilutive potential shares	12,801		13,373		20,697
Weighted average shares - diluted	113,413		111,290		115,382
Net income per share - basic	$	3.46	$	4.33	$	7.92
Net income per share - diluted	$	3.07	$	3.81	$	6.75

Shares which have been excluded from the December 31, 2014, 2013, and 2012 diluted per share amounts because their effect would have been antidilutive, include the following:

	December 31,
(Shares in thousands)	2014	2013	2012
Stock options	1,470	304	325
Convertible senior notes	4,247	4,761	—