CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	COMMON STOCK:	CAPITAL SURPLUS:	ACCUMULATED OTHER COMPREHENSIVE INCOME:	RETAINED EARNINGS:
Balance at beginning of period at Dec. 31, 2009		$ 149	$ 854,081	$ 45,580
Balance at beginning of period, (in shares) at Dec. 31, 2009		148,645
Net issuances of restricted stock, (in shares)		1,574
Repurchases of common stock, (in shares)		(5,762)
Exercises of stock options, (in shares)	1,726	1,726
Net issuances of restricted stock		1	(1)
Translation adjustments	1,540			1,540
Repurchases of common stock		(6)	(103,153)		(52,301)
Cash dividends			(63,147)		(13,768)
Exercise of stock options		2	38,353
Net income	66,069				66,069
Stock-based compensation expense			57,119
Tax impact of equity incentive plans			3,853
Balance at end of period at Dec. 31, 2010		146	787,105	47,120
Balance at end of period, (in shares) at Dec. 31, 2010		146,183
Net issuances of restricted stock, (in shares)		1,425
Repurchases of common stock, (in shares)		(6,328)
Exercises of stock options, (in shares)	806	806
Net issuances of restricted stock		1	(1)
Translation adjustments	(6,233)			(6,233)
Repurchases of common stock		(6)	(20,641)		(149,922)
Cash dividends			(81,024)
Exercise of stock options		1	18,308
Net income	149,922				149,922
Stock-based compensation expense			50,906
Tax impact of equity incentive plans			4,823
Balance at end of period at Dec. 31, 2011	800,505	142	759,476	40,887
Balance at end of period, (in shares) at Dec. 31, 2011		142,086
Net issuances of restricted stock, (in shares)		1,443
Repurchases of common stock, (in shares)		(6,350)
Exercises of stock options, (in shares)	2,260	2,260
Net issuances of restricted stock		1	(1)
Translation adjustments	2,892			2,892
Repurchases of common stock		(6)	(7,715)		(175,015)
Cash dividends			(49,971)		(34,927)
Exercise of stock options		2	42,936
Net income	209,942				209,942
Stock-based compensation expense			41,464
Tax impact of equity incentive plans			11,904
Balance at end of period at Dec. 31, 2012	$ 842,011	$ 139	$ 798,093	$ 43,779
Balance at end of period, (in shares) at Dec. 31, 2012		139,439