Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes (Narrative) (Details)

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Income Taxes Income Taxes (Narrative) (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Income Tax Disclosure [Abstract]  
Deferred Tax Assets, Tax Credit Carryforwards $ 4.2
Tax Credit Carryforward, Expiration Date Minimum 1
Tax Credit Carryforward, Expiration Date Maximum 14