Net Income (Loss) Per Share

12 Months Ended

Dec. 31, 2015

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:



	Year Ended December 31,
	2015		2014		2013
Net income - basic and diluted	$	636,056	$	338,126	$	413,738

(Shares in thousands)
Weighted average shares - basic	103,061		100,612		97,917
Effect of dilutive securities:
Stock options	9,446		9,440		10,233
Restricted stock	477		425		433
Warrants	2,246		2,936		2,707
Dilutive potential shares	12,169		12,801		13,373
Weighted average shares - diluted	115,230		113,413		111,290

Net income per share - basic	$	6.17	$	3.36	$	4.23
Net income per share - diluted	$	5.52	$	2.98	$	3.72

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



	Year Ended December 31,
(Shares in thousands)	2015	2014	2013
Stock options	1,343	1,470	304
Convertible senior notes	994	4,247	4,761