CONDENSED 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, 2010		$ 146	$ 787,105	$ 47,120
Balance at beginning of period, (in shares) at Dec. 31, 2010		146,183
Net issuances of restricted stock, (in shares)		1,265
Repurchases of common stock, (in shares)		(3,151)
Exercises of stock options, (in shares)		584
Net issuances of restricted stock		1	(1)
Net income	63,130				63,130
Foreign currency translation adjustments, net of tax	11,014			11,014
Repurchases of common stock		(3)	(28,412)		(63,130)
Cash dividends			(40,976)
Stock-based compensation expense			25,447
Exercise of stock options		1	13,692
Tax impact of equity incentive plans			1,496
Balance at end of period at Jun. 30, 2011		145	758,351	58,134
Balance at end of period, (in shares) at Jun. 30, 2011		144,881
Balance at beginning of period at Dec. 31, 2011	800,505	142	759,476	40,887
Balance at beginning of period, (in shares) at Dec. 31, 2011		142,086
Net issuances of restricted stock, (in shares)		1,240
Repurchases of common stock, (in shares)		(3,484)
Exercises of stock options, (in shares)		1,844
Net issuances of restricted stock		1	(1)
Net income	93,663				93,663
Foreign currency translation adjustments, net of tax	(2,380)			(2,380)
Repurchases of common stock		(3)	(7,714)		(93,663)
Cash dividends			(42,614)
Stock-based compensation expense			20,205
Exercise of stock options		2	35,389
Tax impact of equity incentive plans			5,970
Balance at end of period at Jun. 30, 2012	$ 809,360	$ 142	$ 770,711	$ 38,507
Balance at end of period, (in shares) at Jun. 30, 2012		141,686