Earnings Per Share Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Computation Of Net Income Per Share

The computation of earnings per share is as follows:

	Three Months Ended				Six Months Ended
	June 30, 2013		June 30, 2012		June 30, 2013		June 30, 2012
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	29,471	$	6,164	$	32,160	$	1,580
Shares used in computation:
Weighted-average common shares outstanding	58,192		55,526		57,089		55,491
Basic earnings per share	$	0.51	$	0.11	$	0.56	$	0.03
Diluted earnings per share:
Net income	$	29,471	$	6,164	$	32,160	$	1,580
Senior Convertible Notes interest expense, net of tax	—		48		49		98
Numerator for diluted earnings per share	$	29,471	$	6,212	$	32,209	$	1,678
Shares used in computation:
Weighted-average common shares outstanding	58,192		55,526		57,089		55,491
Senior Convertible Notes shares	564		2,331		1,442		2,331
Employee stock options	1,834		952		1,838		1,056
Weighted-average number of shares	60,590		58,809		60,369		58,878
Diluted earnings per share	$	0.49	$	0.11	$	0.53	$	0.03

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following table summarizes the potential common shares excluded from the diluted calculation:

	Three Months Ended		Six Months Ended
	June 30, 2013	June 30, 2012	June 30, 2013	June 30, 2012
	(in thousands)
Employee stock options	318	1,184	384	908