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Condensed Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | [1] | 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) | 63,428 |  |  |  | 63,428
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan | 4,027 | $ 1 | 4,026 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  | 97 |  |  |
Issuance of restricted stock |  | $ 6 | (6) |  |
Issuance of restricted stock, shares |  | 588 |  |  |
Forfeitures of restricted stock, shares |  | (13) |  |  |
Stock swaps | (296) |  | (296) |  |
Stock swaps, shares |  | (5) |  |  |
Stock-based compensation expense | 9,875 |  | 9,875 |  |
Balance at Mar. 31, 2018 | 3,143,488 | $ 944 | 1,030,927 |  | 2,111,617
Balance, Shares at Mar. 31, 2018 |  | 94,388 |  |  |
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) | 208,415 |  |  |  |
Balance at Sep. 30, 2018 | 3,015,305 | $ 893 | 998,670 |  | 2,015,742
Balance, Shares at Sep. 30, 2018 |  | 89,349 |  |  |
Balance at Dec. 31, 2017 | 3,066,454 | $ 937 | 1,017,328 |  | 2,048,189
Balance, Shares at Dec. 31, 2017 |  | 93,721 |  |  |
Repurchased common stock | (250,000) |  |  |  |
Balance at Dec. 31, 2018 | 3,087,884 | $ 878 | 992,647 |  | 2,094,359
Balance, Shares at Dec. 31, 2018 |  | 87,820 |  |  |
Balance at Mar. 31, 2018 | 3,143,488 | $ 944 | 1,030,927 |  | 2,111,617
Balance, Shares at Mar. 31, 2018 |  | 94,388 |  |  |
Net income (loss) | 79,412 |  |  |  | 79,412
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan | 8,023 | $ 2 | 8,021 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  | 214 |  |  |
Issuance of restricted stock, shares |  | 9 |  |  |
Forfeitures of restricted stock, shares |  | (32) |  |  |
Stock swaps | (2,365) |  | (2,365) |  |
Stock swaps, shares |  | (50) |  |  |
Stock-based compensation expense | 10,524 |  | 10,524 |  |
Repurchased common stock | (52,160) | $ (12) | (14,534) |  | (37,614)
Repurchased common stock, shares |  | (1,155) |  |  |
Balance at Jun. 30, 2018 | 3,186,922 | $ 934 | 1,032,573 |  | 2,153,415
Balance, Shares at Jun. 30, 2018 |  | 93,374 |  |  |
Net income (loss) | 65,575 |  |  |  | 65,575
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan | 3,863 | $ 1 | 3,862 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  | 108 |  |  |
Issuance of restricted stock, shares |  | 104 |  |  |
Forfeitures of restricted stock, shares |  | (13) |  |  |
Stock-based compensation expense | 8,945 |  | 8,945 |  |
Repurchased common stock | (250,000) | $ (42) | (46,710) |  | (203,248)
Repurchased common stock, shares |  | (4,224) |  |  |
Balance at Sep. 30, 2018 | 3,015,305 | $ 893 | 998,670 |  | 2,015,742
Balance, Shares at Sep. 30, 2018 |  | 89,349 |  |  |
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) | (242,872) |  |  |  | (242,872)
Unrealized holding gain (loss) on investments, net of tax | (194) |  |  | $ (194) |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan | 3,542 | $ 1 | 3,541 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  | 140 |  |  |
Issuance of restricted stock |  | $ 10 | (10) |  |
Issuance of restricted stock, shares |  | 978 |  |  |
Forfeitures of restricted stock, shares |  | (6) |  |  |
Stock swaps | (666) |  | (666) |  |
Stock swaps, shares |  | (20) |  |  |
Stock-based compensation expense | 11,100 |  | 11,100 |  |
Repurchased common stock | (78,982) | $ (25) | (28,740) |  | (50,217)
Repurchased common stock, shares |  | (2,525) |  |  |
Balance at Mar. 31, 2019 | 2,779,812 | $ 864 | 977,872 | (194) | 1,801,270
Balance, Shares at Mar. 31, 2019 |  | 86,387 |  |  |
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) | (1,507,033) |  |  |  |
Repurchased common stock | (144,900) |  |  |  |
Repurchased common stock, shares |  | (5,100) |  |  |
Balance at Sep. 30, 2019 | 1,479,360 | $ 842 | 977,709 | 6 | 500,803
Balance, Shares at Sep. 30, 2019 |  | 84,185 |  |  |
Balance at Mar. 31, 2019 | 2,779,812 | $ 864 | 977,872 | (194) | 1,801,270
Balance, Shares at Mar. 31, 2019 |  | 86,387 |  |  |
Net income (loss) | (8,245) |  |  |  | (8,245)
Unrealized holding gain (loss) on investments, net of tax | 232 |  |  | 232 |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan | 3,675 | $ 2 | 3,673 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  | 155 |  |  |
Issuance of restricted stock |  | $ 1 | (1) |  |
Issuance of restricted stock, shares |  | 123 |  |  |
Forfeitures of restricted stock |  | $ (1) | 1 |  |
Forfeitures of restricted stock, shares |  | (61) |  |  |
Stock-based compensation expense | 15,080 |  | 15,080 |  |
Repurchased common stock | (65,527) | $ (25) | (29,196) |  | (36,306)
Repurchased common stock, shares |  | (2,508) |  |  |
Balance at Jun. 30, 2019 | 2,725,027 | $ 841 | 967,429 | 38 | 1,756,719
Balance, Shares at Jun. 30, 2019 |  | 84,096 |  |  |
Net income (loss) | (1,255,916) |  |  |  | (1,255,916)
Unrealized holding gain (loss) on investments, net of tax | (32) |  |  | (32) |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan | 2,606 | $ 1 | 2,605 |  |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan, shares |  | 124 |  |  |
Issuance of restricted stock, shares |  | 12 |  |  |
Forfeitures of restricted stock, shares |  | (27) |  |  |
Stock-based compensation expense | 8,090 |  | 8,090 |  |
Repurchased common stock | (415) |  | (415) |  |
Repurchased common stock, shares |  | (20) |  |  |
Balance at Sep. 30, 2019 | $ 1,479,360 | $ 842 | $ 977,709 | $ 6 | $ 500,803
Balance, Shares at Sep. 30, 2019 |  | 84,185 |  |  |
[1] | Presented within retained earnings on the consolidated balance sheet as the balance is immaterial.

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