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Condensed 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 (Loss) [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Total
--- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2018 | $ 790 | $ 1,262,063 | $ (1,410) | $ (909,186) | $ 0 | $ (1,410) | $ 353,667 |
Balance (in shares) at Dec. 31, 2018 | 79,044 |  |  |  |  |  |  |
Net income |  |  |  | 1,066,126 |  |  | 1,066,126 |
Total other comprehensive income (loss) |  |  |  |  |  |  | 0 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes |  | 11,576 |  |  |  |  | 11,576 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares | 36 |  |  |  |  |  |  |
Net issuance of common stock upon exercise of stock options | $ 3 | 28,700 |  |  |  |  | 28,703 |
Net issuance of common stock upon exercise of stock options, shares | 233 |  |  |  |  |  |  |
Share-based compensation |  | 15,540 |  |  |  |  | 15,540 |
Share repurchases, including fees | $ (36) | (58,335) |  | (1,249,612) |  |  | $ (1,307,983) |
Share repurchases, including fees, shares | (3,585) |  |  |  |  |  | (3,585,000) |
Balance at end of period at Sep. 30, 2019 | $ 757 | 1,259,544 |  | (1,094,082) | 0 |  | $ 166,219 |
Balance (in shares) at Sep. 30, 2019 | 75,728 |  |  |  |  |  |  |
Balance at beginning of period at Jun. 30, 2019 | $ 767 | 1,258,930 |  | (1,115,015) | 0 |  | 144,682 |
Balance (in shares) at Jun. 30, 2019 | 76,690 |  |  |  |  |  |  |
Net income |  |  |  | 391,293 |  |  | 391,293 |
Total other comprehensive income (loss) |  |  |  |  |  |  | 0 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes |  | 3,523 |  |  |  |  | 3,523 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares | 11 |  |  |  |  |  |  |
Net issuance of common stock upon exercise of stock options | $ 1 | 8,774 |  |  |  |  | 8,775 |
Net issuance of common stock upon exercise of stock options, shares | 52 |  |  |  |  |  |  |
Share-based compensation |  | 5,212 |  |  |  |  | 5,212 |
Share repurchases, including fees | $ (11) | (16,895) |  | (370,360) |  |  | $ (387,266) |
Share repurchases, including fees, shares | (1,025) |  |  |  |  |  | (1,025,000) |
Balance at end of period at Sep. 30, 2019 | $ 757 | 1,259,544 |  | (1,094,082) | 0 |  | $ 166,219 |
Balance (in shares) at Sep. 30, 2019 | 75,728 |  |  |  |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 756 | 1,280,760 |  | (889,066) | 4,890 |  | $ 397,340 | [1]
Balance (in shares) at Dec. 31, 2019 | 75,619 |  |  |  |  |  | 75,618,659 |
Net income |  |  |  | 1,359,357 |  |  | $ 1,359,357 |
Total other comprehensive income (loss) |  |  |  |  | (21,925) |  | (21,925) |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes |  | 12,979 |  |  |  |  | 12,979 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares | 36 |  |  |  |  |  |  |
Net issuance of common stock upon exercise of stock options | $ 3 | 39,503 |  |  |  |  | 39,506 |
Net issuance of common stock upon exercise of stock options, shares | 251 |  |  |  |  |  |  |
Share-based compensation |  | 15,968 |  |  |  |  | 15,968 |
Share repurchases, including fees | $ (26) | (45,511) |  | (1,048,463) |  |  | $ (1,094,000) |
Share repurchases, including fees, shares | (2,634) |  |  |  |  |  | (2,634,000) |
Balance at end of period at Sep. 30, 2020 | $ 733 | 1,303,699 |  | (578,172) | (17,035) |  | $ 709,225 |
Balance (in shares) at Sep. 30, 2020 | 73,272 |  |  |  |  |  | 73,272,379 |
Balance at beginning of period at Jun. 30, 2020 | $ 741 | 1,289,976 |  | (679,506) | (22,111) |  | $ 589,100 |
Balance (in shares) at Jun. 30, 2020 | 74,098 |  |  |  |  |  |  |
Net income |  |  |  | 527,252 |  |  | 527,252 |
Total other comprehensive income (loss) |  |  |  |  | 5,076 |  | 5,076 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes |  | 4,057 |  |  |  |  | 4,057 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares | 9 |  |  |  |  |  |  |
Net issuance of common stock upon exercise of stock options | $ 1 | 21,522 |  |  |  |  | 21,523 |
Net issuance of common stock upon exercise of stock options, shares | 130 |  |  |  |  |  |  |
Share-based compensation |  | 5,190 |  |  |  |  | 5,190 |
Share repurchases, including fees | $ (9) | (17,046) |  | (425,918) |  |  | $ (442,973) |
Share repurchases, including fees, shares | (965) |  |  |  |  |  | (965,000) |
Balance at end of period at Sep. 30, 2020 | $ 733 | $ 1,303,699 |  | $ (578,172) | $ (17,035) |  | $ 709,225 |
Balance (in shares) at Sep. 30, 2020 | 73,272 |  |  |  |  |  | 73,272,379 |
[1] | The balance sheet at December 31, 2019, 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.

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Period Type: | instant