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Note 12 - Segment Information - Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Revenue |  | $ 459,183 | $ 313,355 | $ 876,996 | $ 598,797
Depreciation and amortization |  | 26,190 | 15,617 | 49,802 | 30,690
Operating income |  | 59,622 | 60,270 | 97,193 | 109,123
Interest expense |  | 5,782 | 3,281 | 11,205 | 6,401
Foreign exchange loss (gain) |  | 3,200 | (558) | (7,354) | (2,115)
Other expense (income), net |  | (1,678) | 190 | (3,621) | 52
Income before income taxes |  | 52,318 | 57,357 | 96,963 | 104,785
Electronics [Member] |  |  |  |  |
Revenue |  | 299,357 | 169,387 | 563,768 | 323,154
Depreciation and amortization |  | 15,651 | 8,707 | 29,329 | 17,095
Operating income |  | 67,311 | 42,967 | 121,275 | 78,173
Automotive [Member] |  |  |  |  |
Revenue |  | 127,172 | 116,457 | 253,302 | 224,297
Depreciation and amortization |  | 5,969 | 5,580 | 11,939 | 10,950
Operating income |  | 15,711 | 15,713 | 34,102 | 30,778
Industrial [Member] |  |  |  |  |
Revenue |  | 32,654 | 27,511 | 59,926 | 51,346
Depreciation and amortization |  | 1,467 | 1,330 | 2,927 | 2,645
Operating income |  | 5,279 | 1,905 | 9,988 | 2,012
Other Segments [Member] |  |  |  |  |
Depreciation and amortization |  | 3,103 |  | 5,607 |
Operating income | [1] | $ (28,679) | $ (315) | $ (68,172) | $ (1,840)
[1] | Included in "Other" Operating income (loss) for the 2018 second quarter is $24.4 million ($63.2 million year-to-date) of charges primarily related to IXYS acquisition and include $19.0 million ($36.9 million year-to-date) of purchase accounting inventory charges, $2.3 million ($14.1 million year-to-date) in acquisition-related and integration costs primarily related to legal, accounting and other expenses associated with the acquisition of IXYS, $3.1 million ($5.6 million year-to-date) in backlog amortization costs, stock compensation expense recognized immediately upon close for converted IXYS options related to prior services periods $4.5 million year-to-date and other charges of $2.1 million year-to-date. In addition, there were $3.2 million ($3.9 million year-to-date) of severance and other restructuring charges and $1.1 million of impairment charges ($1.1 million year-to-date) associated with the closure of the Radio Pulse and Custom businesses, respectively.

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