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Income Taxes - Unrecognized Tax Benefits Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Unrecognized Tax Benefits Reconciliation |  |  |
Balance at beginning of year | $ 52,986 | $ 35,879 | $ 24,361
Additions based on tax positions taken during a prior period | 8,574 | 13,018 | 583
Reductions based on tax positions taken during a prior period | (1,749) | (86) | (1,248)
Additions related to positions taken upon finalization of Tax Act during the current period | 0 | 0 | 16,506
Additions based on tax positions taken during the current period | 5,174 | 8,926 | 3,133
Reductions based on tax positions taken during the current period | (831) | (259) | (233)
Reductions related to settlement of tax matters | (538) | 0 | (136)
Reductions related to a lapse of applicable statute of limitations | (1,413) | (4,492) | (7,087)
Balance at end of year | 62,203 | 52,986 | $ 35,879
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 8,100 | $ 5,639 |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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