Income Taxes (Uncertain Tax Positions) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Income Tax Disclosure [Abstract]
Income Tax Examination, Increase (Decrease) in Liability from Prior Year	$ (249)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	249
Balance at end of period	$ 0