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Other Intangible, Net and Goodwill | 3 Months Ended
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Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets and Goodwill | Other Intangibles, Net and Goodwill All intangible assets determined to have finite lives are amortized over their estimated useful lives. The useful life of an intangible asset is the period over which the asset is expected to contribute directly or indirectly to future cash flows. There was no change in the gross amount of identifiable intangible assets during the three months ended March 31, 2019. Amortization expense of $0.6 million and $0.7 million for the three months ended March 31, 2019 and 2018 respectively, was included in depreciation and amortization in the consolidated statements of comprehensive income. Intangible assets subject to amortization consisted of the following at March 31, 2019:
| Amortization period (years) |  | Gross Amount |  | Accumulated Amortization |  | Net intangible assets
|  |  | (in thousands)
Customer relationships | 20 |  | $ | 13,600 |  |  | $ | 2,500 |  |  | $ | 11,100 |
Tradename | 0.5-6 |  | 8,100 |  |  | 7,329 |  |  | 771 |
Covenants not to compete | 1-10 |  | 4,200 |  |  | 2,179 |  |  | 2,021 |
|  |  | $ | 25,900 |  |  | $ | 12,008 |  |  | $ | 13,892 |
The carrying amount of goodwill was $132.4 million at March 31, 2019 and December 31, 2018, respectively.

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- Definition The entire disclosure for goodwill and 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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