Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Common Stock, Shares, Outstanding		60,147,000
Balance, value	$ 609,675	$ 601	$ 279,535	$ 358,678	$ (29,139)
Shares issued under stock option/restricted stock/employee stock purchase plans, net	1,470,000
Shares issued under stock option/restricted stock/employee stock purchase plans, net	$ 15,271	15	15,256
Excess tax benefit related to employee equity awards	0	0
Stock-based compensation	11,168
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 5,400
Stock Repurchased During Period, Shares	(5,306,000)
Stock Repurchased and Retired During Period, Value	$ (197,641)	$ (53)	(197,588)
Unrealized gain (loss) on derivative instruments, net of taxes	624
Foreign currency translation adjustment	(1,523)
Net income	95,972
Common Stock, Shares, Outstanding		56,311,000
Balance, value	$ 538,946	$ 563	113,771	454,650	(30,038)
Shares issued under stock option/restricted stock/employee stock purchase plans, net	788,000
Shares issued under stock option/restricted stock/employee stock purchase plans, net	$ 6,762	8	6,754
Excess tax benefit related to employee equity awards	0	0
Stock-based compensation	15,329
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 7,837
Stock Repurchased During Period, Shares	(2,437,000)
Stock Repurchased and Retired During Period, Value	$ (152,415)	$ (24)	(143,691)	(8,700)
Unrealized gain (loss) on derivative instruments, net of taxes	5,078
Foreign currency translation adjustment	27,050
Net income	$ 129,094
Common Stock, Shares, Outstanding	54,661,877	54,662,000
Balance, value	$ 577,681	$ 547	0	575,044	2,090
Shares issued under stock option/restricted stock/employee stock purchase plans, net	920,000
Shares issued under stock option/restricted stock/employee stock purchase plans, net	$ 12,657	9	12,648
Excess tax benefit related to employee equity awards	0	0
Stock-based compensation	17,932
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 7,153
Stock Repurchased During Period, Shares	(345,000)
Stock Repurchased and Retired During Period, Value	$ 0	$ (4)	4	0
Unrealized gain (loss) on derivative instruments, net of taxes	(3,883)
Foreign currency translation adjustment	(94,075)
Net income	$ 147,821
Common Stock, Shares, Outstanding	55,237,068	55,237,000
Balance, value	$ 665,286	$ 552	$ 37,737	$ 722,865	$ (95,868)