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Revenue (Disaggregation Of revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 657,344 | $ 631,450 | $ 1,960,308 | $ 1,855,642
Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 640,688 | 610,929 | 1,909,415 | 1,788,443
Operating Segments [Member] | Industrial Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 128,304 | 125,941 | 372,048 | 367,881
Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 104,988 | 96,295 | 301,284 | 296,275
Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 96,300 | 102,056 | 290,103 | 273,816
Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 76,608 | 89,112 | 285,276 | 253,678
Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 145,386 | 125,341 | 409,561 | 367,831
Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 89,102 | 72,184 | 251,143 | 228,962
Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 16,656 | 20,521 | 50,893 | 67,199
Americas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 404,137 | 379,417 | 1,217,200 | 1,146,171
Americas [Member] | Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 396,172 | 371,897 | 1,195,085 | 1,122,176
Americas [Member] | Operating Segments [Member] | Industrial Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45,334 | 50,644 | 141,966 | 160,794
Americas [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 97,141 | 89,261 | 278,191 | 275,717
Americas [Member] | Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 58,725 | 55,162 | 173,192 | 150,902
Americas [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 32,016 | 42,587 | 125,603 | 113,007
Americas [Member] | Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 125,110 | 96,688 | 352,747 | 291,048
Americas [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 37,846 | 37,555 | 123,386 | 130,708
Americas [Member] | Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 7,965 | 7,520 | 22,115 | 23,995
Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 210,153 | 208,207 | 602,903 | 581,991
Asia [Member] | Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 201,601 | 195,260 | 574,398 | 538,960
Asia [Member] | Operating Segments [Member] | Industrial Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 67,969 | 58,488 | 180,195 | 156,373
Asia [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 871 | 0 | 1,920
Asia [Member] | Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 34,404 | 41,716 | 106,769 | 108,015
Asia [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 30,494 | 34,071 | 111,280 | 107,420
Asia [Member] | Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 18,018 | 26,257 | 50,446 | 68,989
Asia [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 50,716 | 33,857 | 125,708 | 96,243
Asia [Member] | Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8,552 | 12,947 | 28,505 | 43,031
Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 43,054 | 43,826 | 140,205 | 127,480
Europe [Member] | Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 42,915 | 43,772 | 139,932 | 127,307
Europe [Member] | Operating Segments [Member] | Industrial Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 15,001 | 16,809 | 49,887 | 50,714
Europe [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 7,847 | 6,163 | 23,093 | 18,638
Europe [Member] | Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 3,171 | 5,178 | 10,142 | 14,899
Europe [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 14,098 | 12,454 | 48,393 | 33,251
Europe [Member] | Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,258 | 2,396 | 6,368 | 7,794
Europe [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 540 | 772 | 2,049 | 2,011
Europe [Member] | Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 139 | $ 54 | $ 273 | $ 173

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