Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Accumulated Other Comprehensive Loss	Retained Earnings
Common Stock, Shares, Outstanding		114,625
Common stock and additional paid-in capital	$ 4,290,377
Stockholders' Equity Attributable to Parent	4,292,665
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,288
Retained Earnings (Accumulated Deficit)	0
Net income	96,922	$ 0	$ 0	$ 96,922
Other Comprehensive Income (Loss), Net of Tax	6,106	$ 0	6,106	0
Exercise Of Stock Options And Vesting Of Restricted Stock Units Net Of Shares Withheld For Employee Taxes Shares		232
Exercise Of Stock Options And Vesting Of Restricted Stock Units Net Of Shares Withheld For Employee Taxes	(6,065)	$ (6,065)	0	0
Stock Issued During Period, Shares, Employee Stock Purchase Plans		229
Stock Issued During Period, Value, Employee Stock Purchase Plan	15,758	$ 15,758	0	0
Cumulative-effect adoption of ASU 2016-13	$ (38)	$ 0	0	(38)
Stock Repurchased During Period, Shares	(700)	(732)
Stock Repurchased During Period, Value	$ (75,039)	$ (27,405)	0	47,634
Stock-based compensation	20,956	20,956	0	0
Other Retained Earnings Adjustment	(20)	$ 0	0	(20)
Payments for Repurchase of Common Stock	75,039
Common Stock, Shares, Outstanding		114,354
Common stock and additional paid-in capital	4,293,621
Stockholders' Equity Attributable to Parent	4,351,245
Accumulated Other Comprehensive Income (Loss), Net of Tax	8,394
Retained Earnings (Accumulated Deficit)	$ 49,230
Common Stock, Shares, Outstanding	112,557	112,557
Common stock and additional paid-in capital	$ 4,244,740
Stockholders' Equity Attributable to Parent	4,629,425
Accumulated Other Comprehensive Income (Loss), Net of Tax	29,649
Retained Earnings (Accumulated Deficit)	355,036
Net income	285,626	$ 0	0	285,626
Other Comprehensive Income (Loss), Net of Tax	3,269	$ 0	3,269	0
Exercise Of Stock Options And Vesting Of Restricted Stock Units Net Of Shares Withheld For Employee Taxes Shares		183
Exercise Of Stock Options And Vesting Of Restricted Stock Units Net Of Shares Withheld For Employee Taxes	(13,348)	$ (13,348)	0	0
Stock Issued During Period, Shares, Employee Stock Purchase Plans		165
Stock Issued During Period, Value, Employee Stock Purchase Plan	$ 17,794	$ 17,794	0	0
Stock Repurchased During Period, Shares	(1,700)	(1,695)
Stock Repurchased During Period, Value	$ (300,017)	$ (63,917)	0	(236,100)
Stock-based compensation	25,645	$ 25,645	$ 0	$ 0
Payments for Repurchase of Common Stock	$ 300,017
Common Stock, Shares, Outstanding	111,210
Common stock and additional paid-in capital	$ 4,210,914
Stockholders' Equity Attributable to Parent	4,648,394
Accumulated Other Comprehensive Income (Loss), Net of Tax	32,918
Retained Earnings (Accumulated Deficit)	$ 404,562