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Income Taxes - Narrative and Unrecognised Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes |  |  |
Increase (decrease) in valuation allowance | $ 159,700 | $ (66,500) | $ 2,200
Reconciliation of the beginning and ending amount of unrecognized tax benefits |  |  |
Balance at beginning of period | 24,251 | 22,395 |
Additions related to prior periods tax positions | 3,953 | 726 |
Reductions related to prior periods tax positions | (216) | (82) |
Additions related to current period tax positions | 4,119 | 1,835 |
Settlements | (201) |  |
Reductions due to lapse of applicable statute of limitations | (397) | (557) |
Currency translation adjustment | 88 |  |
Currency translation adjustment |  | (66) |
Balance at end of period | $ 31,597 | 24,251 | 22,395
Interest and penalties as a component of income tax expense |  | $ 200 | $ 100

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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 foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 tax positions taken in prior period tax returns. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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