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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Unrecognized tax benefits | $ 4.6 | $ 6.2

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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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