Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Basic and Diluted Net Income (Loss) Per Share

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

	Three Months Ended March 31,
	2015		2014
Net income - basic and diluted	$	76,021	$	68,305
(Shares in thousands)
Weighted average shares - basic	102,227		98,709
Effect of dilutive securities:
Stock options	9,313		9,879
Restricted stock	467		401
Warrants	2,512		3,162
Dilutive potential shares	12,292		13,442
Weighted average shares - diluted	114,519		112,151
Net income per share - basic	$	0.74	$	0.69
Net income per share - diluted	$	0.66	$	0.61

Antidilutive Securities

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)	2015	2014
Stock options	3,673	3,646
Convertible senior notes	1,929	4,761