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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits, beginning of period | $ 56,702 | $ 57,626 | $ 54,880
Gross increase to positions in prior years | 22,943 | 3,367 | 1,164
Gross decrease to positions in prior years | (24,949) | (5,559) | (612)
Gross increases to current period tax positions | 63,869 | 6,453 | 5,071
Audit settlements | (2,977) | (5,169) | (1,116)
Decrease related to lapsing of statute of limitations | (1,368) | (3,445) | (860)
Effect of change in exchange rates | (1,662) | 3,429 | (901)
Unrecognized tax benefits, end of period | 112,558 | 56,702 | 57,626
The amount of unrecognized tax benefits that, if recognized, would affect our effective tax rate | 111,224 | 55,312 | 56,411
Net interest and penalties expense (benefit) | (990) | (543) | $ 193
Accrued interest | 2,127 | 2,706 |
Accrued penalties | $ 1,758 | $ 2,426 |

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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=84176650&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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