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Income Taxes Unrecognized tax benefits (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Unrecognized tax benefits [Abstract] |  |  |  |
Unrecognized Tax Benefits, Increases Resulting from Prior Period Tax Positions | $ 77 | $ 77 | $ 25 |
Unrecognized Tax Benefits, Increase Resulting from Acquisition | 640 | 0 | 0 |
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions | 3,992 | 345 | 345 |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | (12) | (46) | (2,399) |
Unrecognized Tax Benefits, Decreases Resulting from Settlements with Taxing Authorities | 0 | 0 | (314) |
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations | (170) | (148) | 0 |
Unrecognized Tax Benefits | $ 6,527 | $ 2,000 | $ 1,772 | $ 4,115

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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