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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)
$ in Thousands
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings (deficit) [Member]
Accumulated other comprehensive income (loss) [Member]
Total
Balance at beginning 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        
Net income     1,087,060   1,087,060
Other comprehensive income       (436) (436)
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes   9,430     9,430
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares 22,000        
Net issuance of common stock upon exercise of stock options $ 2 33,770     33,772
Net issuance of common stock upon exercise of stock options, shares 206,000        
Share-based compensation   11,799     11,799
Share repurchases, including fees $ (22) (40,477) (1,023,690)   $ (1,064,189)
Share repurchases, including fees, shares (2,218,000)       (2,218,000)
Balance at end of period at Jun. 30, 2021 $ 691 1,295,363 (1,075,769) (2,591) $ 217,694
Balance (in shares) at Jun. 30, 2021 69,133,000        
Balance at beginning of period at Mar. 31, 2021 $ 697 1,274,033 (1,275,409) (6,298) (6,977)
Balance (in shares) at Mar. 31, 2021 69,735,000        
Net income     585,451   585,451
Other comprehensive income       3,707 3,707
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes   5,340     5,340
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares 11,000        
Net issuance of common stock upon exercise of stock options $ 1 23,926     23,927
Net issuance of common stock upon exercise of stock options, shares 130,000        
Share-based compensation   5,887     5,887
Share repurchases, including fees $ (7) (13,823) (385,811)   $ (399,641)
Share repurchases, including fees, shares (743,000)       (743,000)
Balance at end of period at Jun. 30, 2021 $ 691 1,295,363 (1,075,769) (2,591) $ 217,694
Balance (in shares) at Jun. 30, 2021 69,133,000        
Balance at beginning of period at Dec. 31, 2021 $ 670 1,305,508 (1,365,802) (6,799) $ (66,423) [1]
Balance (in shares) at Dec. 31, 2021 67,029,000       67,029,042
Net income     1,058,640   $ 1,058,640
Other comprehensive income       3,188 3,188
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes   10,574     10,574
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares 19,000        
Net issuance of common stock upon exercise of stock options $ 1 26,021     26,022
Net issuance of common stock upon exercise of stock options, shares 91,000        
Share-based compensation   11,811     11,811
Share repurchases, including fees $ (33) (67,263) (2,083,946)   $ (2,151,242)
Share repurchases, including fees, shares (3,386,000)       (3,386,000)
Balance at end of period at Jun. 30, 2022 $ 638 1,286,651 (2,391,108) (3,611) $ (1,107,430)
Balance (in shares) at Jun. 30, 2022 63,753,000       63,752,833
Balance at beginning of period at Mar. 31, 2022 $ 659 1,309,071 (1,636,267) (1,736) $ (328,273)
Balance (in shares) at Mar. 31, 2022 65,920,000        
Net income     576,760   576,760
Other comprehensive income       (1,875) (1,875)
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes   5,692     5,692
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares 11,000        
Net issuance of common stock upon exercise of stock options   10,583     10,583
Net issuance of common stock upon exercise of stock options, shares 41,000        
Share-based compensation   5,717     5,717
Share repurchases, including fees $ (21) (44,412) (1,331,601)   $ (1,376,034)
Share repurchases, including fees, shares (2,219,000)       (2,219,000)
Balance at end of period at Jun. 30, 2022 $ 638 $ 1,286,651 $ (2,391,108) $ (3,611) $ (1,107,430)
Balance (in shares) at Jun. 30, 2022 63,753,000       63,752,833
[1] The balance sheet at December 31, 2021, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by United States generally accepted accounting principles for complete financial statements.