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v3.20.4

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2017 |  | $ 3,066,454 | $ 937 | $ 1,017,328 | $ 2,048,189
Balance, Shares at Dec. 31, 2017 |  |  | 93,721 |  |
Net income (loss) |  | 268,629 |  |  | 268,629
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 18,919 | $ 5 | 18,914 |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 495 |  |
Issuance of restricted stock and conversion of restricted stock units to common stock |  |  | $ 8 | (8) |
Issuance of restricted stock and conversion of restricted stock units to common stock, shares |  |  | 770 |  |
Stock-based compensation expense |  | 38,703 |  | 38,703 |
Stock swaps |  | (2,661) | $ (1) | (2,660) |
Stock swaps, shares |  |  | (56) |  |
Forfeitures of restricted stock |  |  | $ (1) | 1 |
Forfeitures of restricted stock, shares |  |  | (69) |  |
Repurchased common stock |  | (302,160) | $ (70) | (79,631) | (222,459)
Repurchased common stock, shares |  |  | (7,041) |  |
Balance at Dec. 31, 2018 |  | 3,087,884 | $ 878 | 992,647 | 2,094,359
Balance, Shares at Dec. 31, 2018 |  |  | 87,820 |  |
Net income (loss) |  | (1,497,702) |  |  | (1,497,702)
Unrealized holding gain on investments, net of tax | [1] | 78 |  |  | 78
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 11,947 | $ 5 | 11,942 |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 533 |  |
Issuance of restricted stock and conversion of restricted stock units to common stock |  |  | $ 11 | (11) |
Issuance of restricted stock and conversion of restricted stock units to common stock, shares |  |  | 1,113 |  |
Stock-based compensation expense |  | 42,758 |  | 42,758 |
Stock swaps |  | (689) |  | (689) |
Stock swaps, shares |  |  | (20) |  |
Forfeitures of restricted stock |  |  | $ (1) | 1 |
Forfeitures of restricted stock, shares |  |  | (132) |  |
Repurchased common stock |  | (145,280) | $ (51) | (58,706) | (86,523)
Repurchased common stock, shares |  |  | (5,066) |  |
Balance at Dec. 31, 2019 |  | 1,498,996 | $ 842 | 987,942 | 510,212
Balance, Shares at Dec. 31, 2019 |  |  | 84,248 |  |
Net income (loss) |  | (796,488) |  |  | (796,488)
Contribution from noncontrolling Interests, net of loss | [1] | 232 |  |  | 232
Unrealized holding gain on investments, net of tax | [1] | 3,452 |  |  | 3,452
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  | 7,009 | $ 5 | 7,004 |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  |  | 538 |  |
Issuance of restricted stock and conversion of restricted stock units to common stock |  |  | $ 15 | (15) |
Issuance of restricted stock and conversion of restricted stock units to common stock, shares |  |  | 1,450 |  |
Stock-based compensation expense |  | 43,009 |  | 43,009 |
Forfeitures of restricted stock |  |  | $ (2) | 2 |
Forfeitures of restricted stock, shares |  |  | (173) |  |
Repurchased common stock |  | (8,493) | $ (4) | (8,489) |
Repurchased common stock, shares |  |  | (470) |  |
Balance at Dec. 31, 2020 |  | $ 747,717 | $ 856 | $ 1,029,453 | $ (282,592)
Balance, Shares at Dec. 31, 2020 |  |  | 85,593 |  |
[1] | Presented within retained (deficit) earnings as the balance is immaterial.

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant