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Revenue (Disaggregation of revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 624,703 | $ 581,268
Operating Segments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 608,136 | 557,903
Operating Segments [Member] | Industrial Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 124,560 | 117,186
Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 97,867 | 99,900
Operating Segments [Member] | Medical Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 97,287 | 84,925
Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 102,214 | 75,750
Operating Segments [Member] | Computing Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 103,538 | 100,259
Operating Segments [Member] | Telecommunications Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 82,670 | 79,883
Elimination Of Intersegment Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 16,567 | 23,365
Americas [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 378,785 | 361,320
Americas [Member] | Operating Segments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 372,119 | 353,488
Americas [Member] | Operating Segments [Member] | Industrial Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 52,729 | 54,097
Americas [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 88,414 | 93,409
Americas [Member] | Operating Segments [Member] | Medical Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 54,992 | 47,601
Americas [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45,869 | 32,654
Americas [Member] | Operating Segments [Member] | Computing Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 86,221 | 77,813
Americas [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 43,894 | 47,914
Americas [Member] | Elimination Of Intersegment Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 6,666 | 7,832
Asia [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 195,122 | 179,304
Asia [Member] | Operating Segments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 185,268 | 163,824
Asia [Member] | Operating Segments [Member] | Industrial Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 53,657 | 45,791
Asia [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 1,130 | 132
Asia [Member] | Operating Segments [Member] | Medical Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 38,263 | 32,477
Asia [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 39,233 | 34,694
Asia [Member] | Operating Segments [Member] | Computing Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 14,900 | 19,566
Asia [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 38,085 | 31,164
Asia [Member] | Elimination Of Intersegment Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 9,854 | 15,480
Europe [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 50,796 | 40,644
Europe [Member] | Operating Segments [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 50,749 | 40,591
Europe [Member] | Operating Segments [Member] | Industrial Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 18,174 | 17,298
Europe [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8,323 | 6,359
Europe [Member] | Operating Segments [Member] | Medical Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 4,032 | 4,847
Europe [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 17,112 | 8,402
Europe [Member] | Operating Segments [Member] | Computing Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 2,417 | 2,880
Europe [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 691 | 805
Europe [Member] | Elimination Of Intersegment Sales [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 47 | $ 53

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