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Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets Intangible assets consist of the following:
(In thousands) | September 30, 2018 |  | December 31, 2017
Intangible assets with indefinite lives (Trademarks and Trade Names) | $ | 1,408,848 |  |  | $ | 1,408,848 |
Intangible assets with definite lives (Customer Relationships) | 542,013 |  |  | 542,011 |
Less accumulated amortization (Customer Relationships) | (45,756 | ) |  | (27,771 | )
Intangible assets, net | $ | 1,905,105 |  |  | $ | 1,923,088 |
Amortization expense was $6.0 million and $18.0 million for the three and nine months ended September 30, 2018 and $6.0 million and $17.9 million for the three and nine months ended September 30, 2017, respectively. The unamortized portion of customer relationships will be expensed over their remaining useful lives, from 18 to 23 years. The weighted-average amortization period as of September 30, 2018 for customer relationships was 21.0 years.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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