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Revenue (Disaggregation of revenue) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 678,261 $ 642,924 $ 1,302,964 $ 1,224,192
Operating Segments [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 660,591 619,611 1,268,727 1,177,514
Operating Segments [Member] | Industrial Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 117,768 124,754 242,328 241,940
Operating Segments [Member] | Aerospace And Defense Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 102,508 100,080 200,375 199,980
Operating Segments [Member] | Medical Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 97,048 86,835 194,335 171,760
Operating Segments [Member] | Test And Instrumentation Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 106,070 88,816 208,284 164,566
Operating Segments [Member] | Computing Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 160,637 142,231 264,175 242,490
Operating Segments [Member] | Telecommunications Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 76,560 76,895 159,230 156,778
Elimination Of Intersegment Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 17,670 23,313 34,237 46,678
Americas [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 434,278 405,434 813,063 766,754
Americas [Member] | Operating Segments [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 426,798 396,791 798,917 750,279
Americas [Member] | Operating Segments [Member] | Industrial Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 45,138 56,053 97,867 110,150
Americas [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 94,066 93,047 182,480 186,456
Americas [Member] | Operating Segments [Member] | Medical Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 59,383 48,139 114,375 95,740
Americas [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 47,333 37,766 93,202 70,420
Americas [Member] | Operating Segments [Member] | Computing Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 141,417 116,547 227,638 194,360
Americas [Member] | Operating Segments [Member] | Telecommunications Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 39,461 45,239 83,355 93,153
Americas [Member] | Elimination Of Intersegment Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 7,480 8,643 14,146 16,475
Asia [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 197,628 194,480 392,750 373,784
Asia [Member] | Operating Segments [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 187,525 179,876 372,793 343,700
Asia [Member] | Operating Segments [Member] | Industrial Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 55,919 52,094 109,576 97,885
Asia [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,518 917 2,648 1,049
Asia [Member] | Operating Segments [Member] | Medical Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 34,101 33,822 72,364 66,299
Asia [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 41,552 38,655 80,785 73,349
Asia [Member] | Operating Segments [Member] | Computing Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 17,528 23,166 32,428 42,732
Asia [Member] | Operating Segments [Member] | Telecommunications Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 36,907 31,222 74,992 62,386
Asia [Member] | Elimination Of Intersegment Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 10,103 14,604 19,957 30,084
Europe [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 46,355 43,010 97,151 83,654
Europe [Member] | Operating Segments [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 46,268 42,944 97,017 83,535
Europe [Member] | Operating Segments [Member] | Industrial Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 16,711 16,607 34,885 33,905
Europe [Member] | Operating Segments [Member] | Aerospace And Defense Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 6,924 6,116 15,247 12,475
Europe [Member] | Operating Segments [Member] | Medical Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,564 4,874 7,596 9,721
Europe [Member] | Operating Segments [Member] | Test And Instrumentation Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 17,185 12,395 34,297 20,797
Europe [Member] | Operating Segments [Member] | Computing Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1,692 2,518 4,109 5,398
Europe [Member] | Operating Segments [Member] | Telecommunications Sector [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 192 434 883 1,239
Europe [Member] | Elimination Of Intersegment Sales [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 87 $ 66 $ 134 $ 119