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Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |
Intangible Assets | Intangible Assets Intangible assets consist of finite and indefinite life assets and are reported within Other assets in our consolidated balance sheets. The following is a summary of our intangible assets as of December 31, 2018 (in thousands, except weighted average amortization period):
|  | As of December 31, 2018
|  | Remaining Weighted Average Amortization Period (Years) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Finite-life intangible assets: |  |  |  |  |  |  |  |
Customer relationships |  | 14.8 |  | $ | 97,400 |  |  | $ | 1,082 |  |  | $ | 96,318 |
Galapagos operating licenses |  | 25.8 |  | 47,669 |  |  | 4,206 |  |  | 43,463 |
Other finite-life intangible assets |  | 1.8 |  | 11,560 |  |  | 963 |  |  | 10,597 |
Total finite-life intangible assets |  |  |  | 156,629 |  |  | 6,251 |  |  | 150,378 |
Indefinite-life intangible assets |  |  |  | 351,725 |  |  | — |  |  | 351,725 |
Total intangible assets, net |  |  |  | $ | 508,354 |  |  | $ | 6,251 |  |  | $ | 502,103 |
As of December 31, 2017, finite-life intangible assets had a gross carrying amount and accumulated amortization amount of $11.6 million and $3.7 million, respectively, consisting of operating licenses to operate in the Galapagos Islands. As of December 31, 2017, the remaining weighted average remaining life of these licenses was approximately 26.6 years. The carrying amount of indefinite-life intangible assets was not material as of December 31, 2017. As of December 31, 2018, intangible assets, net include intangible assets acquired in the Silversea Cruises acquisition, which were recorded at fair value at acquisition date as follows:
|  | Fair Value at Acquisition Date (in thousands) |  | Weighted Average Amortization Period (Years)
Silversea Cruises trade name |  | $ | 349,500 |  |  | Indefinite-life
Customer relationships |  | 97,400 |  |  | 15
Galapagos operating license |  | 36,100 |  |  | 26
Other finite-life intangible assets |  | 11,560 |  |  | 2
Total intangible assets |  | $ | 494,560 |  |  |
Amortization expense for finite-life intangible assets was immaterial to our consolidated financial statements for the years ended December 31, 2018, 2017 and 2016. The estimated future amortization for finite-life intangible assets for each of the next five years is as follows (in thousands):
Year |
2019 | $ | 13,959 |
2020 | $ | 12,995 |
2021 | $ | 8,179 |
2022 | $ | 8,179 |
2023 | $ | 8,179 |

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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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