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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common stock [Member] | Additional paid-in capital [Member] | Retained earnings (deficit) [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 1,961,314 | $ 977 | $ 1,281,497 | $ 678,840
Balance (in shares) at Dec. 31, 2015 |  | 97,737,000 |  |
Net income | 1,037,691 |  |  | 1,037,691
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes | 12,614 | $ 1 | 12,613 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares |  | 56,000 |  |
Net issuance of common stock upon exercise of stock options | 47,394 | $ 8 | 47,386 |
Net issuance of common stock upon exercise of stock options, shares |  | 757,000 |  |
Excess tax benefit from share-based compensation | 55,994 |  | 55,994 |
Share based compensation | 17,566 |  | 17,566 |
Share repurchases, including fees | (1,505,437) | $ (57) | (78,349) | (1,427,031)
Share repurchases, shares |  | (5,698,000) |  |
Balance at Dec. 31, 2016 | 1,627,136 | $ 929 | 1,336,707 | 289,500
Balance (in shares) at Dec. 31, 2016 |  | 92,852,000 |  |
Cumulative effective adjustment from adoption of ASU 2016-09 | Adoption of ASU 2016-09 [Member] | 168 |  | 434 | (266)
Net income | 1,133,804 |  |  | 1,133,804
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes | 13,466 |  | 13,466 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares |  | 66,000 |  |
Net issuance of common stock upon exercise of stock options | 33,229 | $ 7 | 33,222 |
Net issuance of common stock upon exercise of stock options, shares |  | 685,000 |  |
Share based compensation | 17,773 |  | 17,773 |
Share repurchases, including fees | $ (2,172,530) | $ (93) | (136,559) | (2,035,878)
Share repurchases, shares | (9,301,000) | (9,301,000) |  |
Balance at Dec. 31, 2017 | $ 653,046 | $ 843 | 1,265,043 | (612,840)
Balance (in shares) at Dec. 31, 2017 | 84,302,187 | 84,302,000 |  |
Net income | $ 1,324,487 |  |  | 1,324,487
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes | 14,173 |  | 14,173 |
Issuance of common stock under employee benefit plans, net of forfeitures and shares withheld to cover taxes, shares |  | 58,000 |  |
Net issuance of common stock upon exercise of stock options | 57,168 | $ 8 | 57,160 |
Net issuance of common stock upon exercise of stock options, shares |  | 745,000 |  |
Share based compensation | 18,806 |  | 18,806 |
Share repurchases, including fees | $ (1,714,013) | $ (61) | (93,119) | (1,620,833)
Share repurchases, shares | (6,061,000) | (6,061,000) |  |
Balance at Dec. 31, 2018 | $ 353,667 | $ 790 | $ 1,262,063 | $ (909,186)
Balance (in shares) at Dec. 31, 2018 | 79,043,919 | 79,044,000 |  |

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