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Income Taxes - Rollforward of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Beginning balance | $ 6,965 | $ 5,560 |
Increases related to positions taken during prior years | 0 | 470 |
Increases related to positions taken during the current year | 1,569 | 1,170 |
Decreases related to positions settled with tax authorities | 0 | 0 |
Decreases as a result of a lapse of applicable statute of limitations | (456) | (664) |
Ending balance | 8,078 | 6,536 |
The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate | $ 8,023 | $ 6,536 | $ 6,900

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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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