Income Taxes (Reconciliation of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized tax benefits — January 1	$ 157	$ 157	$ 157
Gross increases — tax positions in prior period
Unrecognized tax benefits — December 31,	$ 157	$ 157	$ 157