Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Balances (in shares)		229,790,268
Stockholders' Equity Attributable to Parent	$ 1,778,381	$ 23	$ 572,559	$ (132,529)	$ 1,338,328
Net Income	218,180				218,180
Currency Translation Adjustment	13,239			13,239
Options Exercised		2,643,310
Exercise of stock options, net of repurchased shares	(88,734)		9,551
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation					(98,285)
Employee Benefits and Share-based Compensation	5,533		5,533
Balances (in shares)		232,433,578
Stockholders' Equity Attributable to Parent	1,926,599	$ 23	587,643	(119,290)	1,458,223
Balances (in shares)		235,315,337
Stockholders' Equity Attributable to Parent	2,489,516	$ 24	672,727	(121,088)	1,937,853
Net Income	200,285				200,285
Currency Translation Adjustment	$ (7,406)			(7,406)
Options Exercised	771,000	802,670
Exercise of stock options, net of repurchased shares	$ 19,525		20,014
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation					(489)
Employee Benefits and Share-based Compensation	8,913		8,913
Balances (in shares)		236,118,007
Stockholders' Equity Attributable to Parent	$ 2,710,833	$ 24	$ 701,654	$ (128,494)	$ 2,137,649