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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 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