Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 196,300,000	$ 235,858,000	$ 414,740,000	$ 459,277,000
Net Revenue	100.00%	100.00%	100.00%	100.00%
Deferred Revenue	$ 2,794,000		$ 2,794,000		$ 3,173,000
Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 192,444,000	$ 230,643,000	$ 406,215,000	$ 449,309,000
Net Revenue	98.00%	98.00%	98.00%	98.00%
Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 3,856,000	$ 5,215,000	$ 8,525,000	$ 9,968,000
Net Revenue	2.00%	2.00%	2.00%	2.00%
Europe
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 101,894,000	$ 133,991,000	$ 222,862,000	$ 258,835,000
Europe | Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	99,215,000	130,483,000	216,900,000	252,168,000
Europe | Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	2,679,000	3,508,000	5,962,000	6,667,000
North America
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	86,569,000	89,553,000	173,540,000	175,797,000
North America | Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	86,414,000	89,069,000	173,178,000	174,946,000
North America | Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	155,000	484,000	362,000	851,000
Asia/Pacific
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	7,837,000	12,314,000	18,338,000	24,645,000
Asia/Pacific | Product
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	6,815,000	11,091,000	16,137,000	22,195,000
Asia/Pacific | Service
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Net Sales	$ 1,022,000	$ 1,223,000	$ 2,201,000	$ 2,450,000
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%