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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Goodwill and Intangible Assets, Net | Intangible assets, net are summarized as follows:
| December 31,
| 2017 |  | 2016
($ in thousands) |  |  |
Definite-lived intangible assets, net: |  |  |
Investment contracts | $ | 425,747 |  |  | $ | 158,747 |
Accumulated amortization | (167,309 | ) |  | (155,136 | )
Definite-lived intangible assets, net | 258,438 |  |  | 3,611 |
Indefinite-lived intangible assets | 43,516 |  |  | 34,816 |
Total intangible assets, net | $ | 301,954 |  |  | $ | 38,427 |
Activity in goodwill and intangible assets, net is as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
($ in thousands) |  |  |  |  |
Intangible assets, net |  |  |  |  |
Balance, beginning of period | $ | 38,427 |  |  | $ | 40,887 |  |  | $ | 41,783 |
Acquisitions (1) | 275,700 |  |  | — |  |  | 2,400 |
Amortization expense | (12,173 | ) |  | (2,460 | ) |  | (3,296 | )
Balance, end of period | $ | 301,954 |  |  | $ | 38,427 |  |  | $ | 40,887 |
Goodwill |  |  |  |  |
Balance, beginning of period | $ | 6,788 |  |  | $ | 6,701 |  |  | $ | 5,260 |
Acquisition (1) | 163,365 |  |  | — |  |  | 1,441 |
Acquisition related adjustments | — |  |  | 87 |  |  | — |
Balance, end of period | $ | 170,153 |  |  | $ | 6,788 |  |  | $ | 6,701 |
(1) - See Note 3 for details on the acquired intangible assets.

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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