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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The changes in the carrying amount of goodwill for the twelve months ended December 31, 2015, 2016, and 2017 are as follows:
| Industrial | Agricultural | European | Consolidated
(in thousands) |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2014 |  | $ | 57,320 |  |  |  | $ | 695 |  |  |  | $ | 17,676 |  |  |  | $ | 75,691 |
Translation adjustment |  | (1,027 | ) |  |  | (710 | ) |  |  | (1,444 | ) |  |  | (3,181 | )
Goodwill acquired |  | — |  |  |  | 2,999 |  |  |  | — |  |  |  | 2,999 |
Balance at December 31, 2015 |  | $ | 56,293 |  |  |  | $ | 2,984 |  |  |  | $ | 16,232 |  |  |  | $ | 75,509 |
Translation adjustment |  | 154 |  |  |  | 505 |  |  |  | (1,343 | ) |  |  | (684 | )
Balance at December 31, 2016 |  | $ | 56,447 |  |  |  | $ | 3,489 |  |  |  | $ | 14,889 |  |  |  | $ | 74,825 |
Translation adjustment |  | 389 |  |  |  | (27 | ) |  |  | 1,833 |  |  |  | 2,195 |
Goodwill acquired |  | 4,846 |  |  |  | 2,895 |  |  |  | — |  |  |  | 7,741 |
Balance at December 31, 2017 |  | $ | 61,682 |  |  |  | $ | 6,357 |  |  |  | $ | 16,722 |  |  |  | $ | 84,761 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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