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Acquisitions, Goodwill And Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-Lived Intangible Assets |  |  |
Accumulated amortization | $ 75,198 | $ 66,627 |
Net balance | 17,758 | 16,055 | $ 12,704
Indefinite-lived Intangible Assets |  |  |
Total gross cost | 188,141 | 167,562 |
Total net balance | 112,943 | 100,935 |
Purchased Research and Development |  |  |
Indefinite-lived Intangible Assets |  |  |
Gross cost and net balance | 4,687 | 4,687 |
OEM Segment |  |  |
Indefinite-lived Intangible Assets |  |  |
Total net balance | 97,689 | 84,752 |
Aftermarket Segment |  |  |
Indefinite-lived Intangible Assets |  |  |
Total net balance | 15,254 | 16,183 |
Customer Relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Gross cost | 110,784 | 94,560 |
Accumulated amortization | 32,414 | 30,514 |
Net balance | $ 78,370 | $ 64,046 |
Customer Relationships | Minimum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 6 years | 6 years |
Customer Relationships | Maximum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 16 years | 16 years |
Patents |  |  |
Finite-Lived Intangible Assets |  |  |
Gross cost | $ 56,468 | $ 54,293 |
Accumulated amortization | 34,066 | 28,255 |
Net balance | $ 22,402 | $ 26,038 |
Patents | Minimum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 3 years | 3 years |
Patents | Maximum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 19 years | 19 years |
Tradenames |  |  |
Finite-Lived Intangible Assets |  |  |
Gross cost | $ 10,041 | $ 8,935 |
Accumulated amortization | 5,667 | 4,751 |
Net balance | $ 4,374 | $ 4,184 |
Tradenames | Minimum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 3 years | 3 years |
Tradenames | Maximum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 15 years | 15 years |
Non-compete Agreements |  |  |
Finite-Lived Intangible Assets |  |  |
Gross cost | $ 5,852 | $ 4,493 |
Accumulated amortization | 2,975 | 2,800 |
Net balance | $ 2,877 | $ 1,693 |
Non-compete Agreements | Minimum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 3 years | 3 years |
Non-compete Agreements | Maximum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 6 years | 6 years |
Other |  |  |
Finite-Lived Intangible Assets |  |  |
Gross cost | $ 309 | $ 594 |
Accumulated amortization | 76 | 307 |
Net balance | $ 233 | $ 287 |
Other | Minimum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 2 years | 2 years |
Other | Maximum |  |  |
Finite-Lived Intangible Assets |  |  |
Estimated useful life in years | 12 years | 12 years |

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