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Intangible Assets, Net | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net | Intangible Assets, Net Intangible assets, net are summarized as follows:
| September 30, 2018 |  | December 31, 2017
($ in thousands) |  |  |
Definite-lived intangible assets: |  |  |
Investment contracts and other | $ | 487,747 |  |  | $ | 425,747 |
Accumulated amortization | (184,910 | ) |  | (167,309 | )
Definite-lived intangible assets, net | 302,837 |  |  | 258,438 |
Indefinite-lived intangible assets | 43,516 |  |  | 43,516 |
Total intangible assets, net | $ | 346,353 |  |  | $ | 301,954 |
Activity in intangible assets, net is as follows:
| Nine Months Ended September 30,
| 2018 |  | 2017
($ in thousands) |  |  |
Intangible assets, net |  |  |
Balance, beginning of period | $ | 301,954 |  |  | $ | 38,427 |
Additions (1) | 62,000 |  |  | 275,700 |
Amortization | (17,601 | ) |  | (7,110 | )
Balance, end of period | $ | 346,353 |  |  | $ | 307,017 |
(1) See Note 4 for details on the acquired intangible assets related to recent business combinations. Estimated amortization expense of intangible assets for the remainder of fiscal year 2018 and succeeding fiscal years is as follows:
($ in thousands) |  |
Fiscal Year |  | Amount
2018 |  | $ | 7,541 |
2019 |  | 30,110 |
2020 |  | 29,945 |
2021 |  | 29,934 |
2022 |  | 29,809 |
2023 and thereafter |  | 175,498 |
|  | $ | 302,837 |

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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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