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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangible Assets | Goodwill and Other Intangible Assets Intangible assets, net are summarized as follows:
| December 31,
($ in thousands) | 2018 |  | 2017
Definite-lived intangible assets, net: |  |  |
Investment contracts and other | $ | 487,747 |  |  | $ | 425,747 |
Accumulated amortization | (192,451 | ) |  | (167,309 | )
Definite-lived intangible assets, net | 295,296 |  |  | 258,438 |
Indefinite-lived intangible assets | 43,516 |  |  | 43,516 |
Total intangible assets, net | $ | 338,812 |  |  | $ | 301,954 |
Activity in goodwill and intangible assets, net is as follows:
| Years Ended December 31,
($ in thousands) | 2018 |  | 2017 |  | 2016
Intangible assets, net |  |  |  |  |
Balance, beginning of period | $ | 301,954 |  |  | $ | 38,427 |  |  | $ | 40,887 |
Acquisitions (1) | 62,000 |  |  | 275,700 |  |  | — |
Amortization expense | (25,142 | ) |  | (12,173 | ) |  | (2,460 | )
Balance, end of period | $ | 338,812 |  |  | $ | 301,954 |  |  | $ | 38,427 |
Goodwill |  |  |  |  |
Balance, beginning of period | $ | 170,153 |  |  | $ | 6,788 |  |  | $ | 6,701 |
Acquisitions (1) | 120,213 |  |  | 163,365 |  |  | — |
Acquisition related adjustments | — |  |  | — |  |  | 87 |
Balance, end of period | $ | 290,366 |  |  | $ | 170,153 |  |  | $ | 6,788 |
(1) - See Note 4 for details on the acquired goodwill and intangible assets. Definite-lived intangible asset amortization for the next five years and thereafter is estimated as follows ($ in thousands):
Fiscal Year |  | Amount
2019 |  |  | $ | 30,110 |
2020 |  |  | 29,945 |
2021 |  |  | 29,933 |
2022 |  |  | 29,809 |
2023 |  |  | 29,148 |
2024 and Thereafter |  |  | 146,351 |
|  | $ | 295,296 |
At December 31, 2018, the weighted average estimated remaining amortization period for definite-lived intangible assets is 11.5 years.

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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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