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Goodwill and Other Intangible Assets (Schedule of intangible assets and goodwill) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |
Finite-Lived Intangible Assets, Gross | $ 77,536 | $ 76,697
Accumulated amortization | (29,255) | (23,805)
Net carrying amount | 184,287 | 180,934
Net carrying amount | 48,281 | 52,892
Gross carrying amount | 184,287 | 180,934
Accumulated amortization | 0 | 0
AEC Trademarks and trade names [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Finite-Lived Intangible Assets, Gross | 208 | 208
Accumulated amortization | (148) | (135)
Net carrying amount | 60 | 73
Net carrying amount | $ 60 | $ 73
AEC Trademarks and trade names [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 6 years | 6 years
AEC Trademarks and trade names [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 15 years | 15 years
AEC Technology [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Finite-Lived Intangible Assets, Gross | $ 6,522 | $ 6,191
Accumulated amortization | (871) | (387)
Net carrying amount | 5,651 | 5,804
Net carrying amount | $ 5,651 | $ 5,804
AEC Technology [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years | 10 years
AEC Technology [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 15 years | 15 years
AEC Intellectual property [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 15 years | 15 years
Finite-lived Intangible Assets [Roll Forward] |  |
Finite-Lived Intangible Assets, Gross | $ 1,250 | $ 1,250
Accumulated amortization | (68) | (7)
Net carrying amount | 1,182 | 1,243
Net carrying amount | $ 1,182 | $ 1,243
AEC Customer contracts [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 6 years | 6 years
Finite-lived Intangible Assets [Roll Forward] |  |
Finite-Lived Intangible Assets, Gross | $ 17,471 | $ 17,471
Accumulated amortization | (13,110) | (10,927)
Net carrying amount | 4,361 | 6,544
Net carrying amount | 4,361 | 6,544
AEC Customer relationships [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Finite-Lived Intangible Assets, Gross | 51,763 | 51,255
Accumulated amortization | (14,768) | (12,108)
Net carrying amount | 36,995 | 39,147
Net carrying amount | $ 36,995 | $ 39,147
AEC Customer relationships [Member] | Minimum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 8 years | 8 years
AEC Customer relationships [Member] | Maximum [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 15 years | 15 years
AEC Other intangibles [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Acquired finite-lived intangible assets, weighted average useful life | 5 years | 5 years
Finite-lived Intangible Assets [Roll Forward] |  |
Finite-Lived Intangible Assets, Gross | $ 322 | $ 322
Accumulated amortization | (290) | (241)
Net carrying amount | 32 | 81
Net carrying amount | 32 | 81
MC Goodwill [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Net carrying amount | 69,884 | 67,672
Gross carrying amount | 69,884 | 67,672
Accumulated amortization | 0 | 0
AEC Goodwill [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Net carrying amount | 114,403 | 113,262
Gross carrying amount | 114,403 | 113,262
Accumulated amortization | $ 0 | $ 0

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