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Intangible Assets | 6 Months Ended
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Jun. 30, 2019
Finite-Lived Intangible Assets, Net [Abstract] |
Intangible Assets | Intangible Assets Intangible assets at the balance sheet dates comprise the following:
| June 30, 2019
(Dollars in thousands, lives in years) | Weighted Average Useful Life |  | Historical Cost |  | Accumulated Amortization |  | Net Balance
Customer relationships | 9.4 |  | $ | 56,453 |  |  | $ | (38,487 | ) |  | $ | 17,966 |
Trade names and trademarks | 7.4 |  | 6,786 |  |  | (4,543 | ) |  | 2,243 |
Other intangibles | 6.0 |  | 572 |  |  | (271 | ) |  | 301 |
|  |  | $ | 63,811 |  |  | $ | (43,301 | ) |  | $ | 20,510 |
| December 31, 2018
(Dollars in thousands, lives in years) | Weighted Average Useful Life |  | Historical Cost |  | Accumulated Amortization |  | Net Balance
Customer relationships | 9.4 |  | $ | 56,453 |  |  | $ | (35,469 | ) |  | $ | 20,984 |
Trade names and trademarks | 7.4 |  | 6,786 |  |  | (4,029 | ) |  | 2,757 |
Other intangibles | 6.0 |  | 572 |  |  | (233 | ) |  | 339 |
|  |  | $ | 63,811 |  |  | $ | (39,731 | ) |  | $ | 24,080 |
For the three months ended June 30, 2019 and 2018, intangible assets amortization expense was $1.8 million and $2.0 million, respectively. For the six months ended June 30, 2019 and 2018, intangible assets amortization expense was $3.6 million and $3.9 million, 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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