Segments and Geographic Areas (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
United States [Member]
Revenue, Major Customer [Line Items]
Net sales	$ 204,000	$ 173,000	$ 144,000
France [Member]
Revenue, Major Customer [Line Items]
Net sales	44,000	44,000	47,000
United Kingdom [Member]
Revenue, Major Customer [Line Items]
Net sales	36,000	33,000	31,000
Russia [Member]
Revenue, Major Customer [Line Items]
Net sales	$ 35,000	$ 34,000	$ 27,000