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Revenue and Segment Reporting (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 256,038 | $ 257,572 | $ 257,125 | $ 238,087 | $ 243,260 | $ 240,455 | $ 213,276 | $ 215,389 | $ 1,008,822 | $ 912,380 | $ 844,748 |
Income from Operations |  |  |  |  |  |  |  |  | 101,088 | 88,738 | 67,620 |
Goodwill | 83,243 |  |  |  | 84,761 |  |  |  | 83,243 | 84,761 | 74,825 | $ 75,509
Total Identifiable Assets | 721,633 |  |  |  | 639,671 |  |  |  | 721,633 | 639,671 |  |
Industrial |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 598,930 | 522,706 | 484,088 |
Income from Operations |  |  |  |  |  |  |  |  | 64,213 | 51,914 | 35,984 |
Goodwill | 61,107 |  |  |  | 61,682 |  |  |  | 61,107 | 61,682 | 56,447 | 56,293
Total Identifiable Assets | 421,539 |  |  |  | 369,271 |  |  |  | 421,539 | 369,271 |  |
Agricultural |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 235,069 | 227,389 | 205,834 |
Income from Operations |  |  |  |  |  |  |  |  | 22,649 | 24,059 | 20,720 |
Goodwill | 6,230 |  |  |  | 6,357 |  |  |  | 6,230 | 6,357 | 3,489 | 2,984
Total Identifiable Assets | 162,548 |  |  |  | 141,023 |  |  |  | 162,548 | 141,023 |  |
European |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 174,823 | 162,285 | 154,826 |
Income from Operations |  |  |  |  |  |  |  |  | 14,226 | 12,765 | 10,916 |
Goodwill | 15,906 |  |  |  | 16,722 |  |  |  | 15,906 | 16,722 | 14,889 | $ 16,232
Total Identifiable Assets | $ 137,546 |  |  |  | $ 129,377 |  |  |  | 137,546 | 129,377 |  |
Wholegoods |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 802,403 | 714,862 | 663,331 |
Parts |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 186,979 | 182,412 | 167,411 |
Other |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 19,440 | $ 15,106 | $ 14,006 |

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