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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock Issued | Common Stock Issued Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Cumulative Effect, Period of Adoption, Adjusted Balance | Treasury Stock | Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Non-Controlling Interest | Non-Controlling Interest Cumulative Effect, Period of Adoption, Adjustment | Non-Controlling Interest Cumulative Effect, Period of Adoption, Adjusted Balance
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Beginning Balances (in shares) at Dec. 31, 2017 |  |  |  | 47,352 |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 1,630,738 |  |  | $ 473 |  | $ 569,319 |  | $ (89,230) |  | $ (172,342) |  | $ 1,313,298 |  |  | $ 9,220 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under share-based compensation plans (in shares) |  |  |  | 205 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under share-based compensation plans | 2,430 |  |  | $ 2 |  | 2,428 |  |  |  |  |  |  |  |  |  |  |
Share repurchases for tax withholdings | (12,372) |  |  |  |  | (12,372) |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 33,887 |  |  |  |  | 33,887 |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (28,535) |  |  |  |  |  |  | (28,061) |  |  |  |  |  |  | (474) |  |
Net income (loss) | 169,776 |  |  |  |  |  |  |  |  |  |  | 168,295 |  |  | 1,481 |  |
Ending Balance (in shares) at Dec. 31, 2018 |  |  |  | 47,557 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | 1,795,924 |  |  | $ 475 |  | 593,262 |  | (117,291) |  | (172,342) |  | 1,481,593 |  |  | 10,227 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under share-based compensation plans (in shares) |  |  |  | 192 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under share-based compensation plans | 4,941 |  |  | $ 2 |  | 4,939 |  |  |  |  |  |  |  |  |  |  |
Share repurchases for tax withholdings | (10,352) |  |  |  |  | (10,352) |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 45,811 |  |  |  |  | 45,811 |  |  |  |  |  |  |  |  |  |  |
Change in value of redeemable non-controlling interest | (57,315) |  |  |  |  | 41,400 |  |  |  |  |  | (98,715) |  |  |  |  |
Foreign currency translation | 1,784 |  |  |  |  |  |  | 1,842 |  |  |  |  |  |  | (58) |  |
Net income (loss) | 155,729 |  |  |  |  |  |  |  |  |  |  | 156,323 |  |  | (594) |  |
Ending Balance (in shares) at Dec. 31, 2019 |  |  |  | 47,749 | 47,749 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 1,936,522 | $ (8,777) | $ 1,927,745 | $ 477 | $ 477 | 675,060 | $ 675,060 | (115,449) | $ (115,449) | (172,342) | $ (172,342) | 1,539,201 | $ (8,587) | $ 1,530,614 | 9,575 | $ (190) | $ 9,385
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under share-based compensation plans (in shares) | 96 |  |  | 290 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued under share-based compensation plans | $ 9,273 |  |  | $ 2 |  | 9,271 |  |  |  |  |  |  |  |  |  |  |
Fair value of stock issued through private placement, net of issuance costs of $968 (in shares) |  |  |  | 577 |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of stock issued through private placement, net of issuance costs of $968 | 92,976 |  |  | $ 6 |  | 92,970 |  |  |  |  |  |  |  |  |  |  |
Share repurchases for tax withholdings | (9,519) |  |  |  |  | (9,519) |  |  |  |  |  |  |  |  |  |  |
Equity component of the convertible notes, net of allocated issuance costs of $570 and taxes of $13,623 (Note 16) | 41,066 |  |  |  |  | 41,066 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 63,863 |  |  |  |  | 63,863 |  |  |  |  |  |  |  |  |  |  |
Change in value of redeemable non-controlling interest | 40,312 |  |  |  |  |  |  |  |  |  |  | 40,312 |  |  |  |  |
Foreign currency translation | 27,864 |  |  |  |  |  |  | 27,041 |  |  |  |  |  |  | 823 |  |
Transfer of cumulative translation adjustment on the sale of subsidiary | 5,473 |  |  |  |  |  |  | 5,473 |  |  |  |  |  |  |  |  |
Net income (loss) | (281,136) |  |  |  |  |  |  |  |  |  |  | (283,950) |  |  | 2,814 |  |
Ending Balance (in shares) at Dec. 31, 2020 |  |  |  | 48,616 |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 1,917,917 |  |  | $ 485 |  | $ 872,711 |  | $ (82,935) |  | $ (172,342) |  | $ 1,286,976 |  |  | $ 13,022 |  |

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