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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits, beginning of period | $ 112,558 | $ 56,702 | $ 57,626
Gross increase to positions in prior years | 1,067 | 22,943 | 3,367
Gross decrease to positions in prior years | (3,296) | (24,949) | (5,559)
Gross increases to current period tax positions | 13,762 | 63,869 | 6,453
Audit settlements | 0 | (2,977) | (5,169)
Decrease related to lapsing of statute of limitations | (1,574) | (1,368) | (3,445)
Effect of change in exchange rates | (802) | (1,662) | 3,429
Unrecognized tax benefits, end of period | 121,715 | 112,558 | 56,702
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate | 120,410 | 111,224 | 55,312
Net interest and penalties expense (benefit) | 708 | (990) | $ (543)
Accrued interest | 2,849 | 2,127 |
Accrued penalties | $ 1,681 | $ 1,758 |

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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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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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