Income Taxes (Income Tax Provision) (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Current tax expense (benefit) - Foreign					$ 316	$ 315
Total current tax expense					316	315
Deferred tax expense (benefit) - Federal					(485)	(15)	$ 1
Deferred tax expense (benefit) - State					48	42	(4)
Total deferred tax benefit					(437)	27	(3)
Income tax expense (benefit)	$ (437)	$ 316	$ 27	$ 315	$ (121)	$ 342	$ (3)