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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
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance as of January 1 | $ 2,943 | $ 1,839 | $ 616
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | (250) | (246) | 0
Increases for positions taken in current periods | 1,017 | 1,957 | 1,584
Decreases in unrecorded tax positions related to settlement with the taxing authorities | (370) | (607) | (361)
Decreases in unrecorded tax positions related to lapse of statute of limitations | (267) | 0 | 0
Balance as of December 31 | $ 3,073 | $ 2,943 | $ 1,839

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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=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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