CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Treasury Stock	Shares Held Under Employee Participation Plan	Additional Paid-in Capital	Comprehensive Income	Accumulated Other Comprehensive Income	Accumulated Earnings
Balance at Dec. 31, 2010	$ 780,827	$ 528	$ (2,467)	$ (777)	$ 488,384		$ 50,759	$ 244,400
Balance (in shares) at Dec. 31, 2010		52,772
Increase (Decrease) in Stockholders' Equity
Net income	89,019					89,019		89,019
Change in fair value of available for sale securities, net of taxes	(805)					(805)	(805)
Foreign currency translation	(37,732)					(37,732)	(37,732)
Total comprehensive income						50,482
Stock-based compensation	5,305				5,305
Stock-based compensation (in shares)		184
Issuance of restricted shares, net of shares remitted	(1,897)		(1,807)
Issuance of restricted shares, net of shares remitted (in shares)		(40)
Exercise of stock options	1,089	2			1,087
Exercise of stock options (in shares)		53
Net tax benefit on exercise of stock options	1,949				1,949
Employee stock purchase plan	2,451				2,451
Employee stock purchase plan (in shares)		69
Balance at Sep. 30, 2011	$ 840,206	$ 530	$ (4,274)	$ (777)	$ 499,086		$ 12,222	$ 333,419
Balance (in shares) at Sep. 30, 2011		53,038