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Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | 2019 Convertible Senior Notes | 2023 Convertible Senior Notes | Common Stock | Additional paid in capital | Additional paid in capital 2019 Convertible Senior Notes | Additional paid in capital 2023 Convertible Senior Notes | Accumulated other comprehensive income (loss) | Retain earnings (Accumulated deficit)
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (shares) at Dec. 31, 2017 |  |  |  | 21,149,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | $ 399,788 |  |  | $ 21 | $ 798,205 |  |  | $ 2,486 | $ (400,924)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 166,000 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 5,119 |  |  | $ 1 | 5,118 |  |  |  |
Reclassification of equity component of currently redeemable convertible notes | 2,781 |  |  |  | 2,781 |  |  |  |
Share-based compensation | 4,555 |  |  |  | 4,555 |  |  |  |
Repurchase of common stock (shares) |  |  |  | (13,000) |  |  |  |  |
Repurchase of common stock | (1,895) |  |  | $ (1) | (1,894) |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred tax | (110) |  |  |  |  |  |  | (110) |
Net income | 45,279 |  |  |  |  |  |  |  | 45,279
Balance at end of period (shares) at Mar. 31, 2018 |  |  |  | 21,302,000 |  |  |  |  |
Balance at end of period at Mar. 31, 2018 | 481,100 |  |  | $ 21 | 808,765 |  |  | (286) | (327,400)
Balance at beginning of period (shares) at Dec. 31, 2017 |  |  |  | 21,149,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 399,788 |  |  | $ 21 | 798,205 |  |  | 2,486 | (400,924)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 185,803 |  |  |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2018 |  |  |  | 21,226,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | 699,520 |  |  | $ 21 | 883,477 |  |  | (64) | (183,914)
Balance at beginning of period (shares) at Mar. 31, 2018 |  |  |  | 21,302,000 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2018 | 481,100 |  |  | $ 21 | 808,765 |  |  | (286) | (327,400)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 60,000 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 3,296 |  |  |  | 3,296 |  |  |  |
Reclassification of equity component of currently redeemable convertible notes | 16,078 |  |  |  | 16,078 |  |  |  |
Share-based compensation | 4,812 |  |  |  | 4,812 |  |  |  |
Repurchase of common stock (shares) |  |  |  | (267,000) |  |  |  |  |
Repurchase of common stock | (50,832) |  |  |  | (50,832) |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred tax | (495) |  |  |  |  |  |  | (495) |
Derivative associated with Notes and Bond Hedge |  | $ (1,559) | $ (1,807) |  |  | $ (1,559) | $ (1,807) |  |
Loss on settlement of Notes |  | 590 |  |  |  | 590 |  |  |
Tax effect on Notes transactions |  | $ 67 | (3,240) |  |  | $ 67 | (3,240) |  |
Value of warrants issued |  |  | $ 97,805 |  |  |  | $ 97,805 |  |
Other tax adjustments | 838 |  |  |  | 208 |  |  | 630 |
Net income | 73,160 |  |  |  |  |  |  |  | 73,160
Balance at end of period (shares) at Jun. 30, 2018 |  |  |  | 21,095,000 |  |  |  |  |
Balance at end of period at Jun. 30, 2018 | 619,813 |  |  | $ 21 | 874,183 |  |  | (151) | (254,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 131,000 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 6,788 |  |  |  | 6,788 |  |  |  |
Share-based compensation | 5,470 |  |  |  | 5,470 |  |  |  |
Other comprehensive income | 87 |  |  |  |  |  |  | 87 |
Other tax adjustments | 0 |  |  |  | (2,964) |  |  |  | 2,964
Net income | 67,362 |  |  |  |  |  |  |  | 67,362
Balance at end of period (shares) at Sep. 30, 2018 |  |  |  | 21,226,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2018 | 699,520 |  |  | $ 21 | 883,477 |  |  | (64) | (183,914)
Balance at beginning of period (shares) at Dec. 31, 2018 |  |  |  | 20,765,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 560,914 |  |  | $ 21 | 791,114 |  |  | (1,024) | (229,197)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 135,000 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | (991) |  |  |  | (991) |  |  |  |
Share-based compensation | 5,347 |  |  |  | 5,347 |  |  |  |
Repurchase of common stock (shares) |  |  |  | (1,236,000) |  |  |  |  |
Repurchase of common stock | (151,585) |  |  | $ (1) | (151,584) |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred tax | 230 |  |  |  |  |  |  | 230 |
Foreign currency translation adjustment | 291 |  |  |  |  |  |  | 291 |
Other tax adjustments | (569) |  |  |  | (569) |  |  |  |
Net income | 666,337 |  |  |  |  |  |  |  | 666,337
Balance at end of period (shares) at Mar. 31, 2019 |  |  |  | 19,664,000 |  |  |  |  |
Balance at end of period at Mar. 31, 2019 | 1,079,974 |  |  | $ 20 | 643,317 |  |  | (503) | 437,140
Balance at beginning of period (shares) at Dec. 31, 2018 |  |  |  | 20,765,000 |  |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 560,914 |  |  | $ 21 | 791,114 |  |  | (1,024) | (229,197)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Repurchase of common stock | (366,500) |  |  |  |  |  |  |  |
Net income | 636,667 |  |  |  |  |  |  |  |
Balance at end of period (shares) at Sep. 30, 2019 |  |  |  | 17,563,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | 850,581 |  |  | $ 17 | 444,587 |  |  | (1,493) | 407,470
Balance at beginning of period (shares) at Mar. 31, 2019 |  |  |  | 19,664,000 |  |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 1,079,974 |  |  | $ 20 | 643,317 |  |  | (503) | 437,140
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 17,000 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 740 |  |  |  | 740 |  |  |  |
Share-based compensation | 6,571 |  |  |  | 6,571 |  |  |  |
Repurchase of common stock (shares) |  |  |  | (291,000) |  |  |  |  |
Repurchase of common stock | (33,717) |  |  | $ (1) | (33,716) |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred tax | 503 |  |  |  |  |  |  | 503 |
Foreign currency translation adjustment | (542) |  |  |  |  |  |  | (542) |
Other tax adjustments | 2,343 |  |  |  | 2,343 |  |  |  |
Net income | (14,419) |  |  |  |  |  |  |  | (14,419)
Balance at end of period (shares) at Jun. 30, 2019 |  |  |  | 19,390,000 |  |  |  |  |
Balance at end of period at Jun. 30, 2019 | 1,041,453 |  |  | $ 19 | 619,255 |  |  | (542) | 422,721
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net (shares) |  |  |  | 7,000 |  |  |  |  |
Issuance of common stock under employee stock compensation plans, net | 199 |  |  |  | 199 |  |  |  |
Share-based compensation | 6,297 |  |  |  | 6,297 |  |  |  |
Repurchase of common stock (shares) |  |  |  | (1,834,000) |  |  |  |  |
Repurchase of common stock | (181,188) |  |  | $ (2) | (181,186) |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net of deferred tax | (187) |  |  |  |  |  |  | (187) |
Foreign currency translation adjustment | (764) |  |  |  |  |  |  | (764) |
Other tax adjustments | 22 |  |  |  | 22 |  |  |  |
Net income | (15,251) |  |  |  |  |  |  |  | (15,251)
Balance at end of period (shares) at Sep. 30, 2019 |  |  |  | 17,563,000 |  |  |  |  |
Balance at end of period at Sep. 30, 2019 | $ 850,581 |  |  | $ 17 | $ 444,587 |  |  | $ (1,493) | $ 407,470

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