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Income Taxes Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unrecognized tax benefits [Abstract] |  |  |  |
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions | $ 138 | $ 0 | $ 77 |
Unrecognized Tax Benefits, Increase Resulting from Acquisition | 0 | 0 | 640 |
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions | 4,231 | 4,536 | 3,992 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | (3) | (146) | (12) |
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations | (163) | (93) | (170) |
Unrecognized Tax Benefits | $ 15,027 | $ 10,824 | $ 6,527 | $ 2,000

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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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