Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Common Share

Summary Of Calculation Of Basic And Diluted Earnings Per Share

	Three months ended		Six months ended
	June 30,		June 30,
	2011	2010	2011	2010
Net income used for basic calculation	$     34,745	$     21,773	$     61,575	$     42,707
Weighted-average effect of dilutive securities:
Interest expense and debt financing cost amortization, net of tax,  related to our 1.375% convertible senior notes	4	11	16	52
Net income used for diluted calculation	34,749	21,784	61,591	42,759
Shares used in computing earnings per common share—basic	182,962	178,004	182,347	177,510
Weighted-average effect of dilutive securities:
Shares issuable upon the assumed conversion of our 1.375% convertible senior notes	138	904	305	1,062
Stock awards	8,087	6,242	8,138	6,108
Dilutive potential common shares	8,225	7,146	8,443	7,170
Shares used in computing earnings per common share—diluted	191,187	185,150	190,790	184,680
Earnings per common share:
Basic	$         0.19	$         0.12	$         0.34	$         0.24
Diluted	$         0.18	$         0.12	$         0.32	$         0.23

Dilutive Shares Excluded From Calculation Of Earnings Per Share

	Three months ended		Six months ended
	June 30,		June 30,
	2011	2010	2011	2010
Potentially dilutive securities:
Options to purchase common stock	2,142	2,998	1,723	2,622
Unvested restricted stock	9	8	10	10
	2,151	3,006	1,733	2,632