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, 2011		$ 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		142	770,711	38,507
Balance at end of period, (in shares) at Jun. 30, 2012		141,686
Balance at beginning of period at Dec. 31, 2012	842,011	139	798,093	43,779
Balance at beginning of period, (in shares) at Dec. 31, 2012		139,439
Net issuances of restricted stock, (in shares)		958
Repurchases of common stock, (in shares)		(2,517)
Exercises of stock options, (in shares)		974
Net issuances of restricted stock		1	(1)
Net income	118,952				118,952
Foreign currency translation adjustments, net of tax	(11,261)			(11,261)
Repurchases of common stock		(2)			(86,379)
Cash dividends			(12,256)		(32,514)
Stock-based compensation expense			17,976
Exercise of stock options		1	22,396
Tax impact of equity incentive plans			2,827
Balance at end of period at Jun. 30, 2013	$ 861,751	$ 139	$ 829,035	$ 32,518	$ 59
Balance at end of period, (in shares) at Jun. 30, 2013		138,854