Revenue (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 218,440,000	$ 223,419,000
Net Revenue	100.00%	100.00%
Deferred Revenue	$ 4,933,000		$ 3,173,000
Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 213,771,000	$ 218,666,000
Net Revenue	98.00%	98.00%
Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 4,669,000	$ 4,753,000
Net Revenue	2.00%	2.00%
Europe
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 120,968,000	$ 124,844,000
Europe | Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	117,685,000	121,685,000
Europe | Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	3,283,000	3,159,000
North America
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	86,971,000	86,244,000
North America | Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	86,764,000	85,877,000
North America | Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	207,000	367,000
Asia/Pacific
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	10,501,000	12,331,000
Asia/Pacific | Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	9,322,000	11,104,000
Asia/Pacific | Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 1,179,000	$ 1,227,000
General Terms and Conditions
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract Type Sales Split	31.00%
Large National Customers
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract Type Sales Split	26.00%
Government Tenders
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract Type Sales Split	20.00%
Other Customers
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Contract Type Sales Split	23.00%