Operating Segments and Related Information (Details 5) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 434,898	$ 464,712	$ 1,327,223	$ 1,305,650
Industrial
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	177,151	170,942	536,231	490,463
Industrial | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	95,896	81,517	271,451	235,705
Industrial | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	28,208	31,565	96,361	95,909
Industrial | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	37,881	42,697	121,593	115,091
Industrial | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	5,015	4,397	13,553	14,150
Industrial | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	10,151	10,766	33,273	29,608
Government and Defense
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	171,955	169,734	492,313	453,630
Government and Defense | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	114,176	97,723	312,106	276,761
Government and Defense | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	25,378	28,156	61,281	60,734
Government and Defense | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	14,326	5,942	46,373	29,932
Government and Defense | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	13,757	17,533	65,029	55,371
Government and Defense | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	4,318	20,380	7,524	30,832
Commercial
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	85,792	124,036	298,679	361,557
Commercial | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	30,463	71,515	115,957	184,146
Commercial | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	35,024	31,808	121,479	109,199
Commercial | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	10,343	7,777	28,646	25,038
Commercial | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,255	4,507	18,262	17,305
Commercial | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	3,707	8,429	14,335	25,869
Total Segments [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	434,898	464,712	1,327,223	1,305,650
Total Segments [Member] | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	240,535	250,755	699,514	696,612
Total Segments [Member] | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	88,610	91,529	279,121	265,842
Total Segments [Member] | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	62,550	56,416	196,612	170,061
Total Segments [Member] | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	25,027	26,437	96,844	86,826
Total Segments [Member] | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 18,176	$ 39,575	$ 55,132	$ 86,309