Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Enacted Tax Rate Used to Revalue Deferred Tax Assets and Liabilities	21.00%
Effective income tax rate reconciliation, at federal statutory income tax rate	35.00%	35.00%	35.00%
Unrecognized Tax Benefits	$ 1,208	$ 1,228	$ 1,278
Unrecognized tax benefits impact the effective tax rate	$ 785	$ 798