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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cost | $ 244,364 |  |  | $ 244,364 |  | $ 258,764
Accumulated Amortization | (132,796) |  |  | (132,796) |  | (125,564)
Accumulated Impairment Loss | (3,814) |  |  | (3,814) |  | (1,025)
Net Intangible Assets | 107,754 |  |  | 107,754 |  | 132,175
Amortization of intangible assets | 4,200 |  | $ 5,000 | 13,300 | $ 15,000 |
Impairment charge |  |  |  | 30,945 |  |
Aviation |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment charge |  | $ 30,945 |  |  |  |
Aviation | CT Aerospace |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment charge |  | $ 2,800 |  |  |  |
Contract and customer-related |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cost | 213,194 |  |  | 213,194 |  | 227,594
Accumulated Amortization | (107,328) |  |  | (107,328) |  | (102,169)
Accumulated Impairment Loss | (3,814) |  |  | (3,814) |  | (1,025)
Net Intangible Assets | 102,052 |  |  | 102,052 |  | 124,400
Acquired technologies |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cost | 12,400 |  |  | 12,400 |  | 12,400
Accumulated Amortization | (10,505) |  |  | (10,505) |  | (9,660)
Accumulated Impairment Loss | 0 |  |  | 0 |  | 0
Net Intangible Assets | 1,895 |  |  | 1,895 |  | 2,740
Trade names |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Cost | 18,770 |  |  | 18,770 |  | 18,770
Accumulated Amortization | (14,963) |  |  | (14,963) |  | (13,735)
Accumulated Impairment Loss | 0 |  |  | 0 |  | 0
Net Intangible Assets | $ 3,807 |  |  | $ 3,807 |  | $ 5,035

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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