Operating Segments and Related Information (Details 4) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue	$ 448,463	$ 434,898	$ 452,707	$ 439,618	$ 494,784	$ 464,712	$ 434,124	$ 406,814	$ 1,775,686	$ 1,800,434	$ 1,662,167
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									934,527
Europe [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									376,853
Asia [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									255,160
Mid_East/Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									131,055
Canada/Latin_America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									78,091
Total Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue										1,800,434
Total Segments [Member] | United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue										956,438
Total Segments [Member] | Europe [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue										375,474
Total Segments [Member] | Asia [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue										227,047
Total Segments [Member] | Mid_East/Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue										127,796
Total Segments [Member] | Canada/Latin_America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue										113,679
Industrial
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									717,882	672,120	552,580
Industrial | United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									364,443	314,910
Industrial | Europe [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									130,901	140,265
Industrial | Asia [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									159,150	156,201
Industrial | Mid_East/Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									18,089	18,183
Industrial | Canada/Latin_America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									45,299	42,561
Government and defense
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									663,436	629,147	616,777
Government and defense | United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									420,032	379,356
Government and defense | Europe [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									89,725	92,021
Government and defense | Asia [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									55,160	36,484
Government and defense | Mid_East/Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									85,726	87,633
Government and defense | Canada/Latin_America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									12,793	33,653
Commercial
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									394,368	499,167	$ 492,810
Commercial | United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									150,052	262,172
Commercial | Europe [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									156,227	143,188
Commercial | Asia [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									40,850	34,362
Commercial | Mid_East/Africa [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									27,240	21,980
Commercial | Canada/Latin_America [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenue									$ 19,999	$ 37,465