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Acquisitions, Goodwill And Other Intangible Assets (Schedule of Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Goodwill |  |
Net balance, Beginning | $ 89,198 | $ 83,619
Acquisitions | 29,772 | 5,797
Other | 5,213 | (218)
Net balance, Ending | 124,183 | 89,198
OEM Segment |  |
Goodwill |  |
Net balance, Beginning | 74,663 | 69,822
Acquisitions | 29,772 | 5,059
Other | 5,206 | (218)
Net balance, Ending | 109,641 | 74,663
Aftermarket Segment |  |
Goodwill |  |
Net balance, Beginning | 14,535 | 13,797
Acquisitions | 0 | 738
Other | 7 | 0
Net balance, Ending | $ 14,542 | $ 14,535

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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