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Income Taxes - Reconciliation of Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits |  |  |
Balance at beginning of year | $ 40,878 | $ 41,110 | $ 36,229
Additions based on tax positions related to the current year | 4,398 | 7,708 | 6,231
Additions for tax positions of prior years | 0 | 1,200 | 9,377
Reductions for tax positions of prior years | (2,410) | 0 | (2,870)
Reductions for audit settlements | (930) | (3,205) | 0
Reductions resulting from a lapse of the applicable statute of limitations periods | (8,717) | (5,935) | (7,857)
Balance at end of year | $ 33,219 | $ 40,878 | $ 41,110

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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=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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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- Definition Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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