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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings (deficit) [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained earnings (deficit) [Member]
Accumulated other comprehensive income [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Total
Balance at beginning of period (ASU 2016-02 [Member]) at Dec. 31, 2018     $ (1,410)     $ (1,410)  
Balance at beginning of period at Dec. 31, 2018 $ 790 $ 1,262,063   $ (909,186) $ 0   $ 353,667
Balance (in shares) at Dec. 31, 2018 79,044,000            
Net income       1,391,042     1,391,042
Other comprehensive income         4,890   4,890
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes   15,302         15,302
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares 46,000            
Net issuance of common stock upon exercise of stock options $ 5 46,101         46,106
Net issuance of common stock upon exercise of stock options, shares 406,000            
Share-based compensation   20,534         20,534
Share repurchases, including fees $ (39) (63,240)   (1,369,512)     (1,432,791)
Share repurchases, including fees, shares (3,877,000)            
Balance at end of period at Dec. 31, 2019 $ 756 1,280,760   (889,066) 4,890   397,340
Balance (in shares) at Dec. 31, 2019 75,619,000            
Net income       1,752,302     1,752,302
Other comprehensive income         (7,045)   (7,045)
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes   17,314         17,314
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares 48,000            
Net issuance of common stock upon exercise of stock options $ 3 46,279         46,282
Net issuance of common stock upon exercise of stock options, shares 288,000            
Share-based compensation   21,259         21,259
Share repurchases, including fees $ (48) (84,771)   (2,002,375)     $ (2,087,194)
Share repurchases, including fees, shares (4,832,000)           (4,832,000)
Balance at end of period at Dec. 31, 2020 $ 711 1,280,841   (1,139,139) (2,155)   $ 140,258
Balance (in shares) at Dec. 31, 2020 71,123,000           71,123,109
Net income       2,164,685     $ 2,164,685
Other comprehensive income         (4,644)   (4,644)
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes   18,511         18,511
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares 39,000            
Net issuance of common stock upon exercise of stock options $ 4 67,757         67,761
Net issuance of common stock upon exercise of stock options, shares 404,000            
Share-based compensation   23,054         23,054
Share repurchases, including fees $ (45) (84,655)   (2,391,348)     $ (2,476,048)
Share repurchases, including fees, shares (4,537,000)           (4,537,000)
Balance at end of period at Dec. 31, 2021 $ 670 $ 1,305,508   $ (1,365,802) $ (6,799)   $ (66,423)
Balance (in shares) at Dec. 31, 2021 67,029,000           67,029,042