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Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Effective income tax reconciliation table [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate |  | 21.00% |  |
United States |  | $ 104,637 | $ (557,592) | $ 186,677
International |  | 654,622 | 445,762 | 722,696
Income (loss) before income taxes |  | 759,259 | (111,830) | 909,373
Provision (benefit) at statutory tax rate |  | 159,444 | (23,484) | 190,968
State taxes, net of federal benefit |  | 10,218 | (2,051) | 16,166
International effective tax rate differential |  | 3,112 | 17,474 | 7,480
U.S. tax (benefit) on foreign earnings |  | 5,316 | 26,013 | 0
Deductible loss on wind down of business | [1] | 1,937 | (11,311) | 0
Capital loss |  | 0 | 0 | (60,757)
Change in valuation allowance |  | 2,906 | 1,305 | 66,557
Other non-deductible expenses |  | 2,600 | 1,585 | 14,128
Changes in tax accruals |  | 3,089 | 10,418 | (3,968)
Tax Credits |  | (16,075) | (3,034) | (7,884)
Non-deductible portion of impairment of goodwill |  | 0 | 75,900 | 0
Tax Act's transition tax | [2] | 0 | 0 | (28,323)
Other |  | 248 | (4,477) | (6,568)
Provision for income taxes |  | $ 172,795 | $ 88,338 | $ 187,799
[1] | The wind down of the company’s personal computer and mobility asset disposition business resulted in net tax expense (benefit) of $1,937 and $(11,311) during 2020 and 2019, respectively.
[2] | For the year ended December 31, 2018, the company recorded a $28,323 benefit upon finalizing its analysis of the impact from the Tax Act.

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