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Acquisitions, Goodwill And Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets |  |  |
Accumulated amortization | $ 90,658 | $ 75,198 |
Net balance | 19,573 | 17,758 | $ 16,055
Indefinite-lived Intangible Assets |  |  |
Total gross cost | 220,790 | 188,141 |
Total net balance | 130,132 | 112,943 |
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 | 116,648 | 97,689 |
Aftermarket Segment |  |  |
Indefinite-lived Intangible Assets |  |  |
Total net balance | 13,484 | 15,254 |
Customer Relationships |  |  |
Finite-Lived Intangible Assets |  |  |
Gross cost | 138,687 | 110,784 |
Accumulated amortization | 42,276 | 32,414 |
Net balance | $ 96,411 | $ 78,370 |
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 | $ 57,576 | $ 56,468 |
Accumulated amortization | 38,764 | 34,066 |
Net balance | $ 18,812 | $ 22,402 |
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 | $ 10,995 | $ 10,041 |
Accumulated amortization | 5,381 | 5,667 |
Net balance | $ 5,614 | $ 4,374 |
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 | $ 8,536 | $ 5,852 |
Accumulated amortization | 4,128 | 2,975 |
Net balance | $ 4,408 | $ 2,877 |
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 | $ 309 |
Accumulated amortization | 109 | 76 |
Net balance | $ 200 | $ 233 |
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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