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Condensed 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]
Accumulated Other Comprehensive Income (Loss) [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Revision of Prior Period, Accounting Standards Update, Adjustment [Member]
Total
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2019 $ 0   $ 0   $ 0   $ (1,051)   $ 0   $ (1,051)  
Balance at Dec. 31, 2019   $ 363   $ 1,465,697   $ (2,699,119)   $ 2,921,448   $ (5,363)   $ 1,683,026
Balance, Shares at Dec. 31, 2019   36,323       8,568            
Stock-based compensation   $ 0   17,708   $ 0   0   0   17,708
Stock-based compensation, Shares   0       0            
Stock plan transactions and other   $ 2   (181)   $ 0   0   0   (179)
Stock plan transactions and other, Shares   194       0            
Acquisition of treasury stock   $ 0   0   $ (102,031)   0   0   (102,031)
Acquisition of treasury stock, Shares   0       134            
Net income   $ 0   0   $ 0   76,388   0   76,388
Other comprehensive income (loss), net of income tax   0   0   0   0   (1,841)   (1,841)
Balance at Mar. 31, 2020   $ 365   1,483,224   $ (2,801,150)   2,996,785   (7,204)   1,672,020
Balance, Shares at Mar. 31, 2020   36,517       8,702            
Balance (Accounting Standards Update 2016-02 [Member]) at Dec. 31, 2019 $ 0   $ 0   $ 0   $ (1,051)   $ 0   $ (1,051)  
Balance at Dec. 31, 2019   $ 363   1,465,697   $ (2,699,119)   2,921,448   (5,363)   1,683,026
Balance, Shares at Dec. 31, 2019   36,323       8,568            
Net income                       84,563
Other comprehensive income (loss), net of income tax                       (786)
Balance at Jun. 30, 2020   $ 367   1,506,785   $ (2,801,467)   3,004,960   (6,149)   1,704,496
Balance, Shares at Jun. 30, 2020   36,667       8,703            
Balance at Mar. 31, 2020   $ 365   1,483,224   $ (2,801,150)   2,996,785   (7,204)   1,672,020
Balance, Shares at Mar. 31, 2020   36,517       8,702            
Stock-based compensation       23,676               23,676
Stock plan transactions and other   $ 2   (115)               (113)
Stock plan transactions and other, Shares   150                    
Acquisition of treasury stock           $ (317)           (317)
Acquisition of treasury stock, Shares           1            
Net income               8,175       8,175
Other comprehensive income (loss), net of income tax                   1,055   1,055
Balance at Jun. 30, 2020   $ 367   1,506,785   $ (2,801,467)   3,004,960   (6,149)   1,704,496
Balance, Shares at Jun. 30, 2020   36,667       8,703            
Balance at Dec. 31, 2020   $ 367   1,549,909   $ (2,802,075)   3,276,163   (4,229)   2,020,135
Balance, Shares at Dec. 31, 2020   36,704       8,703            
Stock-based compensation   $ 0   55,960   $ 0   0   0   55,960
Stock-based compensation, Shares   0       0            
Stock plan transactions and other   $ 2   632   $ 0   0   0   634
Stock plan transactions and other, Shares   232       0            
Acquisition of treasury stock   $ 0   0   $ (106,036)   0   0   (106,036)
Acquisition of treasury stock, Shares   0       74            
Net income   $ 0   0   $ 0   127,101   0   127,101
Other comprehensive income (loss), net of income tax   0   0   0   0   (263)   (263)
Balance at Mar. 31, 2021   $ 369   1,606,501   $ (2,908,111)   3,403,264   (4,492)   2,097,531
Balance, Shares at Mar. 31, 2021   36,936       8,777            
Balance at Dec. 31, 2020   $ 367   1,549,909   $ (2,802,075)   3,276,163   (4,229)   2,020,135
Balance, Shares at Dec. 31, 2020   36,704       8,703            
Net income                       315,075
Other comprehensive income (loss), net of income tax                       42
Balance at Jun. 30, 2021   $ 370   1,654,195   $ (3,067,458)   3,591,238   (4,187)   2,174,158
Balance, Shares at Jun. 30, 2021   36,988       8,890            
Balance at Mar. 31, 2021   $ 369   1,606,501   $ (2,908,111)   3,403,264   (4,492)   2,097,531
Balance, Shares at Mar. 31, 2021   36,936       8,777            
Stock-based compensation       47,670               47,670
Stock plan transactions and other   $ 1   24               25
Stock plan transactions and other, Shares   52                    
Acquisition of treasury stock           $ (159,347)           (159,347)
Acquisition of treasury stock, Shares           113            
Net income               187,974       187,974
Other comprehensive income (loss), net of income tax                   305   305
Balance at Jun. 30, 2021   $ 370   $ 1,654,195   $ (3,067,458)   $ 3,591,238   $ (4,187)   $ 2,174,158
Balance, Shares at Jun. 30, 2021   36,988       8,890