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Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Common Stock [Member]
Additional Paid-In Capital [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Retained Earnings [Member]
Available-For-Sale Securities [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Available-For-Sale Securities [Member]
Foreign Currency Translation [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Foreign Currency Translation [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Total
Balance at Dec. 31, 2017   $ 359   $ 1,305,090   $ (2,334,409)   $ 2,397,064   $ (306)   $ (3,353)   $ 1,364,445
Balance, Shares at Dec. 31, 2017   35,852       7,826                
Stock-based compensation   $ 0   69,947   $ 0   0   0   0   69,947
Stock-based compensation, Shares   0       0                
Stock plan transactions and other   $ 1   (883)   $ 0   0   0   0   (882)
Stock plan transactions and other, Shares   121       0                
Acquisition of treasury stock (value)   $ 0   0   $ (166,147)   0   0   0   (166,147)
Acquisition of treasury stock (shares)   0       450                
Net income   $ 0   0   $ 0   176,553   0   0   176,553
Other comprehensive income (loss), net of income tax   0   0   0   0   159   (2,736)   (2,577)
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 $ 0       $ 0   $ (2,327)   $ 0   $ 0   $ (2,327)  
Balance at Dec. 31, 2018   $ 360   1,374,154   $ (2,500,556)   2,573,617   (147)   (6,089)   1,441,339
Balance, Shares (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2018 0   0                      
Balance, Shares at Dec. 31, 2018   35,973       8,276                
Stock-based compensation   $ 0   92,062   $ 0   0   0   0   92,062
Stock-based compensation, Shares   0       0                
Stock plan transactions and other   $ 3   (519)   $ 0   0   0   0   (516)
Stock plan transactions and other, Shares   350       0                
Acquisition of treasury stock (value)   $ 0   0   $ (198,563)   0   0   0   (198,563)
Acquisition of treasury stock (shares)   0       292                
Net income   $ 0   0   $ 0   350,158   0   0   350,158
Other comprehensive income (loss), net of income tax   0   0   0   0   147   726   873
Balance (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 $ 0       $ 0   $ (1,051)   $ 0   $ 0   $ (1,051)  
Balance at Dec. 31, 2019   $ 363   1,465,697   $ (2,699,119)   2,921,448   0   (5,363)   1,683,026
Balance, Shares (Accounting Standards Update 2016-13 [Member]) at Dec. 31, 2019 0   0                      
Balance, Shares at Dec. 31, 2019   36,323       8,568                
Stock-based compensation   $ 0   84,463   $ 0   0   0   0   84,463
Stock-based compensation, Shares   0       0                
Stock plan transactions and other   $ 4   (251)   $ 0   0   0   0   (247)
Stock plan transactions and other, Shares   381       0                
Acquisition of treasury stock (value)   $ 0   0   $ (102,956)   0   0   0   (102,956)
Acquisition of treasury stock (shares)   0       135                
Net income   $ 0   0   $ 0   355,766   0   0   355,766
Other comprehensive income (loss), net of income tax   0   0   0   0   0   1,134   1,134
Balance at Dec. 31, 2020   $ 367   $ 1,549,909   $ (2,802,075)   $ 3,276,163   $ 0   $ (4,229)   $ 2,020,135
Balance, Shares at Dec. 31, 2020   36,704       8,703