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Income Taxes Tax Carryforwards (Details) $ in Millions | Dec. 31, 2017 USD ($)
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CALIFORNIA |
Tax Credit Carryforward [Line Items] |
Tax Credit Carryforward, Amount | $ 9.5
UTAH |
Tax Credit Carryforward [Line Items] |
Tax Credit Carryforward, Amount | 0.3
Foreign Tax Authority [Member] |
Tax Credit Carryforward [Line Items] |
Tax Credit Carryforward, Amount | $ 2.7

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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