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Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning balance | [1] | $ 2,392,220 |  | $ 2,368,832 |
Acquisitions |  | 6,149 |  | 57,154 |
Impairment of assets held for sale |  | (7,922) |  |  |
Foreign currency translation adjustment |  | 79,600 |  | (33,766) |
Goodwill, Ending balance |  | 2,470,047 | [2] | 2,392,220 | [1]
Goodwill, Impaired, Accumulated Impairment Loss |  | 1,026,702 |  | 1,018,780 |
Global Components [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning balance | [1] | 1,239,741 |  | 1,230,832 |
Acquisitions |  | 6,149 |  | 20,724 |
Impairment of assets held for sale |  | 0 |  |  |
Foreign currency translation adjustment |  | 18,979 |  | (11,815) |
Goodwill, Ending balance |  | 1,264,869 | [2] | 1,239,741 | [1]
Goodwill, Impaired, Accumulated Impairment Loss |  | 716,925 |  |  |
Global ECS [Member] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill, Beginning balance | [1] | 1,152,479 |  | 1,138,000 |
Acquisitions |  | 0 |  | 36,430 |
Impairment of assets held for sale |  | (7,922) |  |  |
Foreign currency translation adjustment |  | 60,621 |  | (21,951) |
Goodwill, Ending balance |  | 1,205,178 | [2] | 1,152,479 | [1]
Goodwill, Impaired, Accumulated Impairment Loss |  | $ 309,777 |  | $ 301,855 |
[1] | The total carrying value of goodwill of companies acquired as of December 31, 2016 and December 31, 2015 in the table above is reflected net of $1,018,780 of accumulated impairment charges, of which $716,925 was recorded in the global components business segment and $301,855 was recorded in the global ECS business segment.
[2] | The total carrying value of goodwill of companies acquired as of December 31, 2017 in the table above is reflected net of $1,026,702 of accumulated impairment charges, of which $716,925 was recorded in the global components business segment and $309,777 was recorded in the global ECS business segment.

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