Operating Segments and Related Information (Details 5) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 452,707	$ 434,124	$ 892,325	$ 840,938
Industrial
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	188,421	164,736	359,079	319,521
Industrial | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	89,259	77,212	175,555	154,187
Industrial | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	32,610	31,086	68,153	64,344
Industrial | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	49,655	39,170	83,711	72,395
Industrial | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	4,873	7,423	8,538	9,754
Industrial | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	12,024	9,845	23,122	18,841
Government and Defense
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	161,027	145,715	320,358	283,896
Government and Defense | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	102,798	87,806	197,931	179,039
Government and Defense | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	18,701	20,495	35,903	32,578
Government and Defense | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	13,696	11,968	32,049	23,989
Government and Defense | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	24,088	19,613	51,270	37,838
Government and Defense | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	1,744	5,833	3,205	10,452
Commercial
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	103,259	123,673	212,888	237,521
Commercial | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	41,478	59,007	85,493	112,630
Commercial | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	41,678	39,460	86,455	77,391
Commercial | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	9,339	8,583	18,303	17,261
Commercial | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	6,448	8,212	12,008	12,798
Commercial | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	4,316	8,411	10,629	17,441
Total Segments [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	452,707	434,124	892,325	840,938
Total Segments [Member] | United States
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	233,535	224,025	458,979	445,856
Total Segments [Member] | Europe [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	92,989	91,041	190,511	174,313
Total Segments [Member] | Asia [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	72,690	59,721	134,063	113,645
Total Segments [Member] | Mid_East/Africa [Member]
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	35,409	35,248	71,816	60,390
Total Segments [Member] | Canada/Latin America
Business Unit Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 18,084	$ 24,089	$ 36,956	$ 46,734