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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (in thousands, except share data and dividends per share) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Cash dividends per share | $ 0.10 |  |  |  |
Balances, Common Stock, Shares, Outstanding, Beginning at Dec. 31, 2017 |  | 111,687,016 |  |  |
Balances, Total Stockholders' Equity, Beginning at Dec. 31, 2017 | $ 2,394,608 | $ 1,117 | $ 1,741,623 | $ 665,657 | $ (13,789)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 508,407 |  |  | 508,407 |
Other comprehensive income (loss) | 4,378 |  |  |  | 4,378
Cash dividends | (11,191) |  |  | (11,191) |
Issuance of common stock under Employee Stock Purchase Plan (Shares) |  | 199,464 |  |  |
Issuance of common stock under Employee Stock Purchase Plan (Amount) | 3,187 | $ 2 | 3,185 |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Shares) |  | 291,745 |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Amount) | (2,975) | $ 3 | (2,978) |  |
Stock-based compensation expense (Shares) |  | 63,741 |  |  |
Stock-based compensation expense (Amount) | 23,908 | $ 0 | 23,908 |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2018 |  | 112,241,966 |  |  |
Balances, Total Stockholders' Equity, Ending at Dec. 31, 2018 | $ 2,920,322 | $ 1,122 | 1,765,738 | 1,165,842 | (12,380)
Cash dividends per share | $ 0.10 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | $ (187,001) |  |  | (187,001) |
Other comprehensive income (loss) | 1,061 |  |  |  | 1,061
Cash dividends | (11,254) |  |  | (11,254) |
Issuance of common stock under Employee Stock Purchase Plan (Shares) |  | 314,868 |  |  |
Issuance of common stock under Employee Stock Purchase Plan (Amount) | 3,209 | $ 3 | 3,206 |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Shares) |  | 334,399 |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Amount) | (1,661) | $ 4 | (1,665) |  |
Stock-based compensation expense (Shares) |  | 96,719 |  |  |
Stock-based compensation expense (Amount) | $ 24,318 | $ 1 | 24,317 |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2019 | 112,987,952 | 112,987,952 |  |  |
Balances, Total Stockholders' Equity, Ending at Dec. 31, 2019 | $ 2,748,994 | $ 1,130 | 1,791,596 | 967,587 | (11,319)
Cash dividends per share | $ 0.02 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | $ (764,614) |  |  | (764,614) |
Other comprehensive income (loss) | (2,279) |  |  |  | (2,279)
Cash dividends | (2,276) |  |  | (2,276) |
Issuance of common stock under Employee Stock Purchase Plan (Shares) |  | 464,757 |  |  |
Issuance of common stock under Employee Stock Purchase Plan (Amount) | 1,464 | $ 4 | 1,460 |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Shares) |  | 1,022,019 |  |  |
Issuance of common stock upon vesting of RSUs and settlement of PSUs, net of shares used for tax withholdings (Amount) | (1,560) | $ 10 | (1,570) |  |
Stock-based compensation expense (Shares) |  | 267,576 |  |  |
Stock-based compensation expense (Amount) | 14,999 | $ 3 | 14,996 |  |
Issuance of warrants | 21,520 |  | 21,520 |  |
Other | $ (88) |  | (88) |  |
Balances, Common Stock, Shares, Outstanding, Ending at Dec. 31, 2020 | 114,742,304 | 114,742,304 |  |  |
Balances, Total Stockholders' Equity, Ending at Dec. 31, 2020 | $ 2,016,160 | $ 1,147 | $ 1,827,914 | $ 200,697 | $ (13,598)

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