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Goodwill and Other Intangible Assets - Schedule of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Beginning balances | $ 8,647,142 | $ 5,824,726
Goodwill acquired | 82,659 | 2,876,991
Currency translation adjustments | 58,854 | (52,047)
Reclassifications and other | 31,658 | (2,528)
Ending balances | 8,820,313 | 8,647,142
RF Technology |  |
Goodwill [Roll Forward] |  |
Beginning balances | 4,687,670 | 1,993,299
Goodwill acquired | 63,490 | 2,710,223
Currency translation adjustments | 19,337 | (15,118)
Reclassifications and other | 28,394 | (734)
Ending balances | 4,798,891 | 4,687,670
Medical & Scientific Imaging |  |
Goodwill [Roll Forward] |  |
Beginning balances | 3,185,071 | 3,039,197
Goodwill acquired | 0 | 166,768
Currency translation adjustments | 17,582 | (19,100)
Reclassifications and other | 3,264 | (1,794)
Ending balances | 3,205,917 | 3,185,071
Industrial Technology |  |
Goodwill [Roll Forward] |  |
Beginning balances | 363,978 | 374,033
Goodwill acquired | 0 | 0
Currency translation adjustments | 13,540 | (10,055)
Reclassifications and other | 0 | 0
Ending balances | 377,518 | 363,978
Energy Systems & Controls |  |
Goodwill [Roll Forward] |  |
Beginning balances | 410,423 | 418,197
Goodwill acquired | 19,169 | 0
Currency translation adjustments | 8,395 | (7,774)
Reclassifications and other | 0 | 0
Ending balances | $ 437,987 | $ 410,423

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