| **Goodwill and Acquired Intangible Assets (Details 1) (USD $)In Thousands, unless otherwise specified** | 9 Months Ended |
|---------------------------------------------------------------------------------------------------------|----------------|
||
| **Goodwill [Roll Forward]**                                                                             |           |
| Goodwill, Impaired, Accumulated Impairment Loss                                                         | $ 0            |
| Goodwill at beginning of year                                                                           | 235,530        |
| Acquisition                                                                                             | 5,596          |
| Currency translation adjustments                                                                        | 476            |
| Goodwill at end of period                                                                               | 241,602        |
| Engine Mobile Filtration [Member]                                                                       |           |
| **Goodwill [Roll Forward]**                                                                             |           |
| Goodwill at beginning of year                                                                           | 21,087         |
| Acquisition                                                                                             | 0              |
| Currency translation adjustments                                                                        | 245            |
| Goodwill at end of period                                                                               | 21,332         |
| Industrial Environmental Filtration [Member]                                                            |           |
| **Goodwill [Roll Forward]**                                                                             |           |
| Goodwill at beginning of year                                                                           | 214,443        |
| Acquisition                                                                                             | 5,596          |
| Currency translation adjustments                                                                        | 231            |
| Goodwill at end of period                                                                               | 220,270        |
| Packaging [Member]                                                                                      |           |
| **Goodwill [Roll Forward]**                                                                             |           |
| Goodwill at beginning of year                                                                           | 0              |
| Acquisition                                                                                             | 0              |
| Currency translation adjustments                                                                        | 0              |
| Goodwill at end of period                                                                               | $ 0            |

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| - Definition
Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The accumulated impairment losses related to goodwill as of the balance sheet date.
+ References
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| - Definition
The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.
+ References
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