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Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets The gross carrying amount and accumulated amortization by intangible asset class were as follows:
| (Dollars in thousands)
| March 31, 2021 |  | December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Value
Trade names | $ | 11,432 |  |  | $ | (3,079) |  |  | $ | 8,353 |  |  | $ | 11,289 |  |  | $ | (2,733) |  |  | $ | 8,556 |
Customer relationships | 12,456 |  |  | (2,739) |  |  | 9,717 |  |  | 12,349 |  |  | (2,402) |  |  | 9,947 |
| $ | 23,888 |  |  | $ | (5,818) |  |  | $ | 18,070 |  |  | $ | 23,638 |  |  | $ | (5,135) |  |  | $ | 18,503 |
Amortization expense of $0.6 million and $0.3 million related to intangible assets was recorded in General and administrative expenses for the three months ended March 31, 2021 and 2020, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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- References No definition available. + Details
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