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Acquisitions, Goodwill And Other Intangible Assets (Schedule of Other Intangible Assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets |  |
Accumulated amortization | $ 104,764 | $ 90,658
Indefinite-lived Intangible Assets |  |
Total gross cost | 281,106 | 220,790
Total net balance | 176,342 | 130,132
Trade name |  |
Indefinite-lived Intangible Assets |  |
Gross cost and net balance | 7,600 |
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 | 159,803 | 116,648
Aftermarket Segment |  |
Indefinite-lived Intangible Assets |  |
Total net balance | 16,539 | 13,484
Customer relationships |  |
Finite-Lived Intangible Assets |  |
Gross cost | 191,919 | 138,687
Accumulated amortization | 54,889 | 42,276
Net balance | $ 137,030 | $ 96,411
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 | $ 58,787 | $ 57,576
Accumulated amortization | 40,079 | 38,764
Net balance | $ 18,708 | $ 18,812
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
Trade name |  |
Finite-Lived Intangible Assets |  |
Gross cost | $ 10,885 | $ 10,995
Accumulated amortization | 5,507 | 5,381
Net balance | $ 5,378 | $ 5,614
Trade name | Minimum |  |
Finite-Lived Intangible Assets |  |
Estimated useful life in years | 3 years | 3 years
Trade name | Maximum |  |
Finite-Lived Intangible Assets |  |
Estimated useful life in years | 15 years | 15 years
Non-compete agreements |  |
Finite-Lived Intangible Assets |  |
Gross cost | $ 6,919 | $ 8,536
Accumulated amortization | 4,148 | 4,128
Net balance | $ 2,771 | $ 4,408
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 | 141 | 109
Net balance | $ 168 | $ 200
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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