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Goodwill and Other Intangible Assets (Schedule of intangible assets and goodwill) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Finite-Lived Intangible Assets, Gross | $ 77,134 |  | $ 77,134 | $ 76,697
Accumulated amortization | (27,428) |  | (27,428) | (23,805)
Net carrying amount | 181,302 |  | 181,302 | 180,934
Net carrying amount | 49,706 |  | 49,706 | 52,892
Gross carrying amount | 181,302 |  | 181,302 | 180,934
Accumulated amortization | 0 |  | 0 | 0
Trade Names [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Finite-Lived Intangible Assets, Gross | 208 |  | 208 | 208
Accumulated amortization | (143) |  | (143) | (135)
Net carrying amount | 65 |  | 65 | 73
Net carrying amount | $ 65 |  | 65 | 73
Trade Names [Member] | Minimum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 6 years | 6 years |  |
Trade Names [Member] | Maximum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 15 years | 15 years |  |
Developed Technology Rights [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Finite-Lived Intangible Assets, Gross | $ 6,262 |  | 6,262 | 6,191
Accumulated amortization | (696) |  | (696) | (387)
Net carrying amount | 5,566 |  | 5,566 | 5,804
Net carrying amount | $ 5,566 |  | $ 5,566 | $ 5,804
Developed Technology Rights [Member] | Minimum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years | 10 years |  |
Developed Technology Rights [Member] | Maximum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 15 years | 15 years |  |
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 | $ 1,250
Accumulated amortization | (48) |  | (48) | (7)
Net carrying amount | 1,202 |  | 1,202 | 1,243
Net carrying amount | 1,202 |  | $ 1,202 | $ 1,243
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 | $ 17,471
Accumulated amortization | (12,383) |  | (12,383) | (10,927)
Net carrying amount | 5,088 |  | 5,088 | 6,544
Net carrying amount | 5,088 |  | 5,088 | 6,544
Customer Relationships [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Finite-Lived Intangible Assets, Gross | 51,621 |  | 51,621 | 51,255
Accumulated amortization | (13,885) |  | (13,885) | (12,108)
Net carrying amount | 37,736 |  | 37,736 | 39,147
Net carrying amount | $ 37,736 |  | $ 37,736 | $ 39,147
Customer Relationships [Member] | Minimum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 8 years | 8 years |  |
Customer Relationships [Member] | Maximum [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 15 years | 15 years |  |
Other Intangible Assets [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 | $ 322
Accumulated amortization | (273) |  | (273) | (241)
Net carrying amount | 49 |  | 49 | 81
Net carrying amount | 49 |  | 49 | 81
MC Goodwill [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Net carrying amount | 67,689 |  | 67,689 | 67,672
Gross carrying amount | 67,689 |  | 67,689 | 67,672
Accumulated amortization | 0 |  | 0 | 0
AEC Goodwill [Member] |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Net carrying amount | 113,613 |  | 113,613 | 113,262
Gross carrying amount | 113,613 |  | 113,613 | 113,262
Accumulated amortization | $ 0 |  | $ 0 | $ 0

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