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Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock Class A Common Stock | Common Stock Class B Convertible Common Stock | Common Stock Class C Common Stock | Additional Paid-in-Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (shares) at Dec. 31, 2018 |  | 187,710 | 34,450 | 226,422 |  |  |
Beginning balance at Dec. 31, 2018 | $ 2,016,871 | $ 62 | $ 11 | $ 75 | $ 916,628 | $ 1,139,082 | $ (38,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (shares) |  | 355 |  | 271 |  |  |
Exercise of stock options | 1,638 |  |  |  | 1,638 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  | (15) |  | (217) |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | (4,088) |  |  |  |  | (4,088) |
Issuance of common stock, net of forfeitures (shares) |  | 151 |  | 2,405 |  |  |
Issuance of common stock, net of forfeitures | 4,138 |  |  | $ 1 | 4,137 |  |
Stock-based compensation expense | 38,048 |  |  |  | 38,048 |  |
Comprehensive income (loss) | 97,059 |  |  |  |  | 107,443 | (10,384)
Ending balance (shares) at Sep. 30, 2019 |  | 188,201 | 34,450 | 228,881 |  |  |
Ending balance at Sep. 30, 2019 | 2,153,666 | $ 62 | $ 11 | $ 76 | 960,451 | 1,242,437 | (49,371)
Beginning balance (shares) at Jun. 30, 2019 |  | 188,144 | 34,450 | 228,653 |  |  |
Beginning balance at Jun. 30, 2019 | 2,048,274 | $ 62 | $ 11 | $ 76 | 946,488 | 1,141,129 | (39,492)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (shares) |  | 40 |  | 34 |  |  |
Exercise of stock options | 265 |  |  |  | 265 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  |  |  | (59) |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | (1,007) |  |  |  |  | (1,007) |
Issuance of common stock, net of forfeitures (shares) |  | 17 |  | 253 |  |  |
Issuance of common stock, net of forfeitures | 1,285 |  |  |  | 1,285 |  |
Stock-based compensation expense | 12,413 |  |  |  | 12,413 |  |
Comprehensive income (loss) | 92,436 |  |  |  |  | 102,315 | (9,879)
Ending balance (shares) at Sep. 30, 2019 |  | 188,201 | 34,450 | 228,881 |  |  |
Ending balance at Sep. 30, 2019 | 2,153,666 | $ 62 | $ 11 | $ 76 | 960,451 | 1,242,437 | (49,371)
Beginning balance (shares) at Dec. 31, 2019 |  | 188,290 | 34,450 | 229,028 |  |  |
Beginning balance at Dec. 31, 2019 | 2,150,087 | $ 62 | $ 11 | $ 76 | 973,717 | 1,226,986 | (50,765)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (shares) |  | 147 |  | 135 |  |  |
Exercise of stock options | 517 |  |  |  | 517 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  | (1) |  | (233) |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | (3,285) |  |  |  |  | (3,285) |
Issuance of common stock, net of forfeitures (shares) |  | 98 |  | 2,755 |  |  |
Issuance of common stock, net of forfeitures | 3,638 |  |  | $ 1 | 3,637 |  |
Stock-based compensation expense | 32,770 |  |  |  | 32,770 |  |
Equity Component value of convertible note issuance, net | 40,342 |  |  |  | 40,342 |  |
Comprehensive income (loss) | (753,723) |  |  |  |  | (733,630) | (20,093)
Ending balance (shares) at Sep. 30, 2020 |  | 188,534 | 34,450 | 231,685 |  |  |
Ending balance at Sep. 30, 2020 | 1,470,346 | $ 62 | $ 11 | $ 77 | 1,050,983 | 490,071 | (70,858)
Beginning balance (shares) at Jun. 30, 2020 |  | 188,461 | 34,450 | 231,354 |  |  |
Beginning balance at Jun. 30, 2020 | 1,423,414 | $ 62 | $ 11 | $ 77 | 1,044,055 | 450,750 | (71,541)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (shares) |  | 2 |  | 2 |  |  |
Exercise of stock options | 18 |  |  |  | 18 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  |  |  | (57) |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | 375 |  |  |  |  | 375 |
Issuance of common stock, net of forfeitures (shares) |  | 71 |  | 386 |  |  |
Issuance of common stock, net of forfeitures | 978 |  |  |  | 978 |  |
Stock-based compensation expense | 9,513 |  |  |  | 9,513 |  |
Equity Component value of convertible note issuance, net | (3,581) |  |  |  | (3,581) |  |
Comprehensive income (loss) | 39,629 |  |  |  |  | 38,946 | 683
Ending balance (shares) at Sep. 30, 2020 |  | 188,534 | 34,450 | 231,685 |  |  |
Ending balance at Sep. 30, 2020 | $ 1,470,346 | $ 62 | $ 11 | $ 77 | $ 1,050,983 | $ 490,071 | $ (70,858)

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