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Revenue (Disaggregation of revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 624,230 | $ 678,261 | $ 1,247,657 | $ 1,302,964
Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 601,602 | 660,591 | 1,204,422 | 1,268,727
Operating Segments [Member] | Industrials Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 114,664 | 118,096 | 231,037 | 243,744
Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 106,965 | 100,177 | 210,854 | 196,296
Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 114,187 | 96,729 | 217,665 | 193,803
Operating Segments [Member] | Semi-Cap Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 62,450 | 106,293 | 128,471 | 208,668
Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 132,690 | 160,637 | 257,000 | 264,175
Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 70,646 | 78,659 | 159,395 | 162,041
Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 22,628 | 17,670 | 43,235 | 34,237
Americas [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 404,162 | 434,278 | 796,220 | 813,063
Americas [Member] | Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 391,004 | 426,798 | 769,961 | 798,917
Americas [Member] | Operating Segments [Member] | Industrials Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 43,618 | 43,948 | 86,386 | 96,635
Americas [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 98,523 | 93,254 | 194,860 | 181,049
Americas [Member] | Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 67,962 | 59,476 | 126,374 | 114,468
Americas [Member] | Operating Segments [Member] | Semi-Cap Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 26,139 | 47,556 | 54,538 | 93,586
Americas [Member] | Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 119,907 | 141,417 | 230,174 | 227,638
Americas [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 34,855 | 41,147 | 77,629 | 85,541
Americas [Member] | Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 13,158 | 7,480 | 26,259 | 14,146
Asia [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 174,170 | 197,628 | 361,579 | 392,750
Asia [Member] | Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 164,923 | 187,525 | 344,972 | 372,793
Asia [Member] | Operating Segments [Member] | Industrials Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 51,645 | 57,437 | 107,227 | 112,224
Asia [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0 | 0
Asia [Member] | Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 41,446 | 34,101 | 81,904 | 72,364
Asia [Member] | Operating Segments [Member] | Semi-Cap Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 23,726 | 41,552 | 48,469 | 80,785
Asia [Member] | Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 12,731 | 17,528 | 26,741 | 32,428
Asia [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 35,375 | 36,907 | 80,631 | 74,992
Asia [Member] | Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 9,247 | 10,103 | 16,607 | 19,957
Europe [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45,898 | 46,355 | 89,858 | 97,151
Europe [Member] | Operating Segments [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 45,675 | 46,268 | 89,489 | 97,017
Europe [Member] | Operating Segments [Member] | Industrials Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 19,401 | 16,711 | 37,424 | 34,885
Europe [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 8,442 | 6,923 | 15,994 | 15,247
Europe [Member] | Operating Segments [Member] | Medical Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 4,779 | 3,152 | 9,387 | 6,971
Europe [Member] | Operating Segments [Member] | Semi-Cap Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 12,585 | 17,185 | 25,464 | 34,297
Europe [Member] | Operating Segments [Member] | Computing Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 52 | 1,692 | 85 | 4,109
Europe [Member] | Operating Segments [Member] | Telecommunications Sector [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 416 | 605 | 1,135 | 1,508
Europe [Member] | Elimination Of Intersegment Sales [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 223 | $ 87 | $ 369 | $ 134

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