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Revenue and Segment Information - Revenue, Income, Goodwill and Identifiable Assets by Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | $ 285,186 | $ 257,125 | $ 547,120 | $ 495,212 |
Income from Operations | 29,349 | 26,786 | 51,955 | 48,147 |
Goodwill | 93,134 |  | 93,134 |  | $ 83,243
Total Identifiable Assets | 866,579 |  | 866,579 |  | 721,633
Industrial |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 168,000 | 150,031 | 326,425 | 282,198 |
Income from Operations | 20,172 | 16,165 | 36,644 | 27,965 |
Goodwill | 61,433 |  | 61,433 |  | 61,107
Total Identifiable Assets | 465,860 |  | 465,860 |  | 421,539
Agricultural |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 55,159 | 59,071 | 108,332 | 117,718 |
Income from Operations | 4,234 | 6,186 | 6,406 | 11,439 |
Goodwill | 6,276 |  | 6,276 |  | 6,230
Total Identifiable Assets | 177,673 |  | 177,673 |  | 162,548
European |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Net Sales | 62,027 | 48,023 | 112,363 | 95,296 |
Income from Operations | 4,943 | $ 4,435 | 8,905 | $ 8,743 |
Goodwill | 25,425 |  | 25,425 |  | 15,906
Total Identifiable Assets | $ 223,046 |  | $ 223,046 |  | $ 137,546

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