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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of principal reporting segments | segment |  |  |  |  |  |  |  |  | 3 |  |  |
Net Revenue | $ 243,260 | $ 240,455 | $ 213,276 | $ 215,389 | $ 205,522 | $ 216,766 | $ 211,489 | $ 210,971 | $ 912,380 | $ 844,748 | $ 879,577 |
Income from Operations |  |  |  |  |  |  |  |  | 88,738 | 67,620 | 66,528 |
Goodwill | 84,761 |  |  |  | 74,825 |  |  |  | 84,761 | 74,825 | 75,509 | $ 75,691
Total Identifiable Assets | 639,671 |  |  |  | 552,776 |  |  |  | 639,671 | 552,776 |  |
Industrial |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Revenue |  |  |  |  |  |  |  |  | 522,706 | 484,088 | 498,761 |
Income from Operations |  |  |  |  |  |  |  |  | 51,914 | 35,984 | 42,194 |
Goodwill | 61,682 |  |  |  | 56,447 |  |  |  | 61,682 | 56,447 | 56,293 | 57,320
Total Identifiable Assets | 369,271 |  |  |  | 339,064 |  |  |  | 369,271 | 339,064 |  |
Agricultural |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Revenue |  |  |  |  |  |  |  |  | 227,389 | 205,834 | 208,257 |
Income from Operations |  |  |  |  |  |  |  |  | 24,059 | 20,720 | 17,295 |
Goodwill | 6,357 |  |  |  | 3,489 |  |  |  | 6,357 | 3,489 | 2,984 | 695
Total Identifiable Assets | 141,023 |  |  |  | 111,120 |  |  |  | 141,023 | 111,120 |  |
European |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Revenue |  |  |  |  |  |  |  |  | 162,285 | 154,826 | 172,559 |
Income from Operations |  |  |  |  |  |  |  |  | 12,765 | 10,916 | 7,039 |
Goodwill | 16,722 |  |  |  | 14,889 |  |  |  | 16,722 | 14,889 | $ 16,232 | $ 17,676
Total Identifiable Assets | $ 129,377 |  |  |  | $ 102,592 |  |  |  | $ 129,377 | $ 102,592 |  |

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