Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2013

Earnings Per Share [Abstract]

Basic and Diluted Net Income Per Share

The calculations of basic and diluted net income per share are as follows:

	Three Months Ended March 31,
	2013		2012
Net income - basic and diluted	$	98,874	$	11,651
(Shares in thousands)
Weighted average shares - basic	96,878		93,446
Effect of dilutive securities:
Stock options	10,276		13,630
Restricted stock	325		658
Warrants	1,890
Dilutive potential shares	12,491		14,288
Weighted average shares - diluted	109,369		107,734
Net income per share - basic	$	1.02	$	0.12
Net income per share - diluted	$	0.90	$	0.11

Antidilutive Securities

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

	Three Months Ended March 31,
(Shares in thousands)	2013	2012
Stock options	3,868	89
Convertible senior notes	4,761	4,761
Warrants		4,761