Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective income tax rate reconciliation [Abstract]
Statutory federal income tax benefit	$ 3,578	$ 4,548
State tax benefit, net of federal taxes	45	48
Foreign tax	(2)	0
Foreign deferred exchange rate adjustments	(1,112)	899
Nondeductible/nontaxable items	(259)	(114)
New federal rate adjustment	0	(16,081)
Other	(72)	(1,085)
Valuation allowance decrease (increase)	(2,184)	11,779
Total income tax benefit expense	$ (6)	$ (6)