Income Taxes (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract]
Provisional tax expense, Tax Cuts and Jobs Act	$ 3.5

Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense

No definition available.

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