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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) |  | 315 |  | 237 |  |  |
Exercise of stock options | 1,376 |  |  |  | 1,376 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  | (15) |  | (158) |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | (3,081) |  |  |  |  | (3,081) |
Issuance of common stock, net of forfeitures (shares) |  | 134 |  | 2,152 |  |  |
Issuance of common stock, net of forfeitures | 2,860 |  |  | $ 1 | 2,859 |  |
Stock-based compensation expense | 25,625 |  |  |  | 25,625 |  |
Comprehensive income (loss) | 4,623 |  |  |  |  | 5,128 | (505)
Ending balance (shares) at Jun. 30, 2019 |  | 188,144 | 34,450 | 228,653 |  |  |
Ending balance at Jun. 30, 2019 | 2,048,274 | $ 62 | $ 11 | $ 76 | 946,488 | 1,141,129 | (39,492)
Beginning balance (shares) at Mar. 31, 2019 |  | 187,980 | 34,450 | 228,489 |  |  |
Beginning balance at Mar. 31, 2019 | 2,049,807 | $ 62 | $ 11 | $ 76 | 931,352 | 1,158,482 | (40,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (shares) |  | 161 |  | 59 |  |  |
Exercise of stock options | 529 |  |  |  | 529 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  | (5) |  | (6) |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | (4) |  |  |  |  | (4) |
Issuance of common stock, net of forfeitures (shares) |  | 8 |  | 111 |  |  |
Issuance of common stock, net of forfeitures | 1,473 |  |  | $ 0 | 1,473 |  |
Stock-based compensation expense | 13,134 |  |  |  | 13,134 |  |
Comprehensive income (loss) | (16,665) |  |  |  |  | (17,349) | 684
Ending balance (shares) at Jun. 30, 2019 |  | 188,144 | 34,450 | 228,653 |  |  |
Ending balance at Jun. 30, 2019 | 2,048,274 | $ 62 | $ 11 | $ 76 | 946,488 | 1,141,129 | (39,492)
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) |  | 145 |  | 133 |  |  |
Exercise of stock options | 499 |  |  |  | 499 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  | (1) |  | (176) |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | (3,660) |  |  |  |  | (3,660) |
Issuance of common stock, net of forfeitures (shares) |  | 27 |  | 2,369 |  |  |
Issuance of common stock, net of forfeitures | 2,360 |  |  | $ 1 | 2,359 |  |
Stock-based compensation expense | 23,257 |  |  |  | 23,257 |  |
Equity Component value of convertible note issuance, net | 44,223 |  |  |  | 44,223 |  |
Comprehensive income (loss) | (793,352) |  |  |  |  | (772,576) | (20,776)
Ending balance (shares) at Jun. 30, 2020 |  | 188,461 | 34,450 | 231,354 |  |  |
Ending balance at Jun. 30, 2020 | 1,423,414 | $ 62 | $ 11 | $ 77 | 1,044,055 | 450,750 | (71,541)
Beginning balance (shares) at Mar. 31, 2020 |  | 188,451 | 34,450 | 231,150 |  |  |
Beginning balance at Mar. 31, 2020 | 1,550,180 | $ 62 | $ 11 | $ 77 | 985,831 | 634,452 | (70,253)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Exercise of stock options (shares) |  | 2 |  | 2 |  |  |
Exercise of stock options | 14 |  |  |  | 14 |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares) |  | 0 |  | 0 |  |  |
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements | (807) |  |  |  |  | (807) |
Issuance of common stock, net of forfeitures (shares) |  | 8 |  | 202 |  |  |
Issuance of common stock, net of forfeitures | 1,195 |  |  | $ 0 | 1,195 |  |
Stock-based compensation expense | 12,792 |  |  |  | 12,792 |  |
Equity Component value of convertible note issuance, net | 44,223 |  |  |  | 44,223 |  |
Comprehensive income (loss) | (184,183) |  |  |  |  | (182,895) | (1,288)
Ending balance (shares) at Jun. 30, 2020 |  | 188,461 | 34,450 | 231,354 |  |  |
Ending balance at Jun. 30, 2020 | $ 1,423,414 | $ 62 | $ 11 | $ 77 | $ 1,044,055 | $ 450,750 | $ (71,541)

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