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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract] |
Goodwill / Tradename |
(Table only in thousands) |  | Environmental Segment |  |  | Energy Segment |  |  | Fluid Handling and Filtration Segment |  |  | Totals |
Balance of goodwill at December 31, 2013 |  | $ | 22,657 |  |  | $ | 14,174 |  |  | $ | 93,057 |  |  | $ | 129,888 |
2014 acquisitions |  |  | 32,374 |  |  |  | 4,752 |  |  |  | — |  |  |  | 37,126 |
Foreign currency translation |  |  | — |  |  |  | (1,153 | ) |  |  | — |  |  |  | (1,153 | )
Balance of goodwill at December 31, 2014 |  |  | 55,031 |  |  |  | 17,773 |  |  |  | 93,057 |  |  |  | 165,861 |
2015 acquisition |  |  | — |  |  |  | 55,655 |  |  |  | — |  |  |  | 55,655 |
Foreign currency translation |  |  | — |  |  |  | (1,353 | ) |  |  | — |  |  |  | (1,353 | )
Balance of goodwill at December 31, 2015 |  | $ | 55,031 |  |  | $ | 72,075 |  |  | $ | 93,057 |  |  | $ | 220,163 |
|  | Tradenames |
(Table only in thousands) |  | 2015 |  |  | 2014 |
Beginning balance |  | $ | 19,766 |  |  | $ | 18,419 |
Acquisitions and related adjustments |  |  | 10,280 |  |  |  | 1,730 |
Impairment |  |  | (3,340 | ) |  |  | — |
Foreign currency adjustments |  |  | (369 | ) |  |  | (383 | )
|  | $ | 26,337 |  |  | $ | 19,766 |
Intangible Assets - Finite Life |
|  | 2015 |  |  | 2014 |
(Table only in thousands) Intangible assets – finite life |  | Cost |  |  | Accum. Amort. |  |  | Cost |  |  | Accum. Amort |
Patents |  | $ | 1,456 |  |  | $ | 1,456 |  |  | $ | 1,429 |  |  | $ | 1,427 |
Employment agreements |  |  | 733 |  |  |  | 677 |  |  |  | 733 |  |  |  | 461 |
Technology |  |  | 15,867 |  |  |  | 4,027 |  |  |  | 8,677 |  |  |  | 2,412 |
Customer lists |  |  | 77,497 |  |  |  | 17,756 |  |  |  | 59,017 |  |  |  | 9,094 |
Noncompetition agreements |  |  | 1,118 |  |  |  | 257 |  |  |  | 1,118 |  |  |  | 34 |
Tradename |  |  | 1,390 |  |  |  | 162 |  |  |  | 1,390 |  |  |  | 23 |
Backlog |  |  | 4,270 |  |  |  | 1,423 |  |  |  | — |  |  |  | — |
Foreign currency adjustments |  |  | (2,309 | ) |  |  | (693 | ) |  |  | (800 | ) |  |  | (285 | )
|  | $ | 100,022 |  |  | $ | 25,065 |  |  | $ | 71,564 |  |  | $ | 13,166 |

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