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Condensed Consolidated Statements Of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock [Member]
Additional Paid-In Capital [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Total
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, 2021 $ 371 1,729,312 $ (3,356,102) 3,929,147 (5,354) 2,297,374
Balance, Shares at Dec. 31, 2021 37,132   9,052      
Stock-based compensation $ 0 24,077 $ 0 0 0 24,077
Stock-based compensation, Shares 0   0      
Stock plan transactions and other $ 2 (61) $ 0 0 0 (59)
Stock plan transactions and other, Shares 134   0      
Acquisition of treasury stock $ 0 0 $ (345,921) 0 0 (345,921)
Acquisition of treasury stock, Shares 0   230      
Net income $ 0 0 $ 0 158,294 0 158,294
Other comprehensive income (loss), net of income tax 0 0 0 0 195 195
Balance at Mar. 31, 2022 $ 373 $ 1,753,328 $ (3,702,023) $ 4,087,441 $ (5,159) $ 2,133,960
Balance, Shares at Mar. 31, 2022 37,266   9,282