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Revenue and Segment Information - Revenue, Income, Goodwill and Identifiable Assets by Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | $ 271,829 | $ 257,572 | $ 818,949 | $ 752,784 |
Income from Operations | 24,455 | 28,249 | 76,410 | 76,396 |
Goodwill | 93,468 |  | 93,468 |  | $ 83,243
Total Identifiable Assets | 856,393 |  | 856,393 |  | 721,633
Industrial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 158,499 | 156,721 | 484,924 | 438,919 |
Income from Operations | 14,350 | 18,351 | 50,994 | 46,316 |
Goodwill | 61,341 |  | 61,341 |  | 61,107
Total Identifiable Assets | 470,927 |  | 470,927 |  | 421,539
Agricultural |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 59,797 | 61,464 | 168,129 | 179,182 |
Income from Operations | 6,140 | 6,608 | 12,546 | 18,047 |
Goodwill | 5,833 |  | 5,833 |  | 6,230
Total Identifiable Assets | 169,818 |  | 169,818 |  | 162,548
European |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 53,533 | 39,387 | 165,896 | 134,683 |
Income from Operations | 3,965 | $ 3,290 | 12,870 | $ 12,033 |
Goodwill | 26,294 |  | 26,294 |  | 15,906
Total Identifiable Assets | $ 215,648 |  | $ 215,648 |  | $ 137,546

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