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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 72,338 | $ 83,214 | $ 93,461 | $ 68,034
Additions based on tax positions related to the current year | 3,134 | 4,493 | 15,580 |
Additions for tax positions of prior years | 5,490 | 6,668 | 29,637 |
Reductions for tax positions of prior years | (3,599) | (9,217) | (5,226) |
Settlements | (6,214) | (922) | (7,345) |
Lapse of statutes | (9,687) | (11,269) | (7,219) |
Unrecognized potential tax benefits that would impact effective tax rate | 65,500 |  |  |
Potential interest and penalty expense (income) | (100) | (600) | $ 2,400 |
Accrued interest and penalties | 17,800 | $ 17,800 |  |
Minimum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound | 0 |  |  |
Maximum [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, estimated range of change, upper bound | $ 30,900 |  |  |

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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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