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Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in unrecognized tax benefits |  |  |
Balance at beginning of year | $ 12,369 | $ 11,137 | $ 8,269
Additions for tax positions related to current year | 1,217 | 3,075 | 2,154
Additions for tax positions relating to prior years | 47 | 21 | 1,721
Reductions for tax positions relating to prior years | (1,166) | (1,814) | (934)
Reductions due to the lapse of the applicable statute of limitations |  |  | (26)
Settlements | (104) | (50) | (47)
Balance at end of year | 12,363 | 12,369 | $ 11,137
Unrecognized tax benefits that would impact effective tax rate if recognized | 1,400 |  |
Accrued interest and penalties related to unrecognized tax benefits | $ 400 | $ 400 |

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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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