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)		709
Repurchases of common stock, (in shares)		(1,926)
Exercises of stock options, (in shares)		1,434
Net issuances of restricted stock		1	(1)
Net income	48,334				48,334
Foreign currency translation adjustments, net of tax	4,072			4,072
Repurchases of common stock		(2)	(8,058)		(48,334)
Cash dividends			(21,370)
Stock-based compensation expense			8,886
Exercise of stock options		1	26,082
Tax impact of equity incentive plans			5,564
Balance at end of period at Mar. 31, 2012		142	770,579	44,959
Balance at end of period, (in shares) at Mar. 31, 2012		142,303
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)		510
Repurchases of common stock, (in shares)		(1,289)
Exercises of stock options, (in shares)		866
Net issuances of restricted stock		1	(1)
Net income	55,863				55,863
Foreign currency translation adjustments, net of tax	(5,771)			(5,771)
Repurchases of common stock		(1)			(45,672)
Cash dividends			(12,256)		(10,191)
Stock-based compensation expense			8,208
Exercise of stock options		1	19,938
Tax impact of equity incentive plans			2,394
Balance at end of period at Mar. 31, 2013	$ 854,524	$ 140	$ 816,376	$ 38,008
Balance at end of period, (in shares) at Mar. 31, 2013		139,526