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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Reserve for Authorized But Unissued Shares of Common Stock | As of December 31, 2020, the Company had reserved the following authorized but unissued shares of common stock for future issuances:
Common stock options and restricted stock units | 5,960,946 |
Common stock employee purchase plans | 2,806,672 |
Total | 8,767,618 |
Components of Accumulated Other Comprehensive Loss, Net of Tax | The changes in accumulated other comprehensive loss, net of tax, by components are as follows (in thousands):
| December 31, 2017 |  | Net Change |  | Cumulative Effect Adjustment |  | December 31, 2018 |  | Net Change |  | December 31, 2019 |  | Net Change |  |  |  | December 31, 2020
Foreign currency translation adjustment ("CTA") gain (loss) | $ | (576,860) |  |  | $ | (421,743) |  |  | $ | — |  |  | $ | (998,603) |  |  | $ | (58,315) |  |  | $ | (1,056,918) |  |  | $ | 548,503 |  |  |  |  | $ | (508,415) |
Unrealized gain (loss) on cash flow hedges (1) | (24,191) |  |  | 43,671 |  |  | — |  |  | 19,480 |  |  | (3,842) |  |  | 15,638 |  |  | (82,790) |  |  |  |  | (67,152) |
Net investment hedge CTA gain (loss) (1) | (185,303) |  |  | 219,628 |  |  | — |  |  | 34,325 |  |  | 73,294 |  |  | 107,619 |  |  | (444,553) |  |  |  |  | (336,934) |
Unrealized gain (loss) on available for sale securities (2) | 2,124 |  |  | — |  |  | (2,124) |  |  | — |  |  | — |  |  | — |  |  | — |  |  |  |  | — |
Net actuarial gain (loss) on defined benefit plans (3) | (959) |  |  | 55 |  |  | — |  |  | (904) |  |  | (48) |  |  | (952) |  |  | 85 |  |  |  |  | (867) |
| $ | (785,189) |  |  | $ | (158,389) |  |  | $ | (2,124) |  |  | $ | (945,702) |  |  | $ | 11,089 |  |  | $ | (934,613) |  |  | $ | 21,245 |  |  |  |  | $ | (913,368) |
(1)Refer to Note 8 for a discussion of the amounts reclassified from accumulated other comprehensive loss to net income. (2)Upon adoption of ASU 2016-01 during the three months ended March 31, 2018, the Company recorded a net cumulative effect adjustment of $2.1 million from accumulated other comprehensive loss to retained earnings. (3)The Company has a defined benefit pension plan covering all employees in two countries where such plans are mandated by law. The Company does not have any defined benefit plans in any other countries. The unamortized gain (loss) on defined benefit plans includes gains or losses resulting from a change in the value of either the projected benefit obligation or the plan assets resulting from a change in an actuarial assumption, net of amortization.
Quarterly Dividend and Special Distributions | During the years ended December 31, 2020, 2019 and 2018, the Company's Board of Directors declared quarterly dividends whose treatment for federal income tax purposes were as follows:
Declaration Date |  | Record Date |  | Payment Date |  | Total Distribution (1) |  | Nonqualified Ordinary Dividend (2) |  | Total Distribution Amount |  |  |  |
|  |  |  |  |  | (per share) |  | (in thousands) |  |  |  |
Fiscal 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2/12/2020 |  | 2/26/2020 |  | 3/18/2020 |  | $ | 2.660000 |  |  | $ | 2.660000 |  |  | $ | 227,386 |  |  |  |  |
5/6/2020 |  | 5/20/2020 |  | 6/17/2020 |  | 2.660000 |  |  | 2.660000 |  |  | 235,449 |  |  |  |  |
7/29/2020 |  | 8/19/2020 |  | 9/23/2020 |  | 2.660000 |  |  | 2.660000 |  |  | 236,424 |  |  |  |  |
10/28/2020 |  | 11/18/2020 |  | 12/9/2020 |  | 2.660000 |  |  | 2.660000 |  |  | 237,010 |  |  |  |  |
Total |  |  |  |  |  | $ | 10.640000 |  |  | $ | 10.640000 |  |  | $ | 936,269 |  |  |  |  |
Fiscal 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2/13/2019 |  | 2/27/2019 |  | 3/20/2019 |  | $ | 2.460000 |  |  | $ | 2.460000 |  |  | $ | 198,933 |  |  |  |  |
5/1/2019 |  | 5/22/2019 |  | 6/19/2019 |  | 2.460000 |  |  | 2.460000 |  |  | 207,949 |  |  |  |  |
7/31/2019 |  | 8/21/2019 |  | 9/18/2019 |  | 2.460000 |  |  | 2.460000 |  |  | 209,226 |  |  |  |  |
10/30/2019 |  | 11/20/2019 |  | 12/11/2019 |  | 2.460000 |  |  | 2.460000 |  |  | 209,785 |  |  |  |  |
Total |  |  |  |  |  | $ | 9.840000 |  |  | $ | 9.840000 |  |  | $ | 825,893 |  |  |  |  |
Fiscal 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2/14/2018 |  | 2/26/2018 |  | 3/21/2018 |  | $ | 2.280000 |  |  | $ | 2.280000 |  |  | $ | 180,640 |  |  |  |  |
5/2/2018 |  | 5/23/2018 |  | 6/20/2018 |  | 2.280000 |  |  | 2.280000 |  |  | 181,207 |  |  |  |  |
8/8/2018 |  | 8/22/2018 |  | 9/19/2018 |  | 2.280000 |  |  | 2.280000 |  |  | 182,304 |  |  |  |  |
11/1/2018 |  | 11/14/2018 |  | 12/12/2018 |  | 2.280000 |  |  | 2.280000 |  |  | 183,297 |  |  |  |  |
Total |  |  |  |  |  | $ | 9.120000 |  |  | $ | 9.120000 |  |  | $ | 727,448 |  |  |  |  |
(1)Common stock dividends are characterized for federal income tax purposes as nonqualified ordinary dividend, qualified ordinary dividend, capital gains or return of capital. During the years ended December 31, 2020, 2019 and 2018, the Company did not classify any portion of the distributions as qualified ordinary dividend, capital gains or return of capital. (2)All nonqualified ordinary dividends are eligible for the 20% deduction generally allowable to non-corporate shareholders under Internal Revenue Code Section 199A.

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