Operating Segments and Related Information (Details 5) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 444,736	$ 439,618
Industrial
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	179,370	170,658
Industrial | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	101,211	86,296
Industrial | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	31,308	35,543
Industrial | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	34,434	34,057
Industrial | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	3,769	3,664
Industrial | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	8,648	11,098
Government and Defense
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	173,350	159,331
Government and Defense | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	109,304	95,133
Government and Defense | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	26,596	17,203
Government and Defense | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	17,386	18,351
Government and Defense | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	17,407	27,184
Government and Defense | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	2,657	1,460
Commercial
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	92,016	109,629
Commercial | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	32,211	44,015
Commercial | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	42,556	44,777
Commercial | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,959	8,965
Commercial | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,096	5,559
Commercial | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	4,194	6,313
Total Segments [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	444,736	439,618
Total Segments [Member] | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	242,726	225,444
Total Segments [Member] | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	100,460	97,523
Total Segments [Member] | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	58,779	61,373
Total Segments [Member] | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	27,272	36,407
Total Segments [Member] | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 15,499	$ 18,871