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Income Taxes (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2017 USD ($)
Income Tax Disclosure [Abstract] |
Expected refund in 2017 | $ 9.0
Expected refunds in future periods | 11.0
Tax benefit due to release of a portion of valuation allowance previously offsetting deferred tax assets associated with existing AMT credit carryforwards | $ 20.0

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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 + Details
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