Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
United States federal	$ 683	$ 712	$ 176
State and local	42	59	(44)
Foreign	368	(125)	136
Total current	1,093	646	268
Deferred:
United States federal	(3,643)	3	(1,636)
State and local	2	1	1
Foreign	(230)	126	77
Total deferred	(3,871)	130	(1,558)
Total income tax expense (benefit)	$ (2,778)	$ 776	$ (1,290)