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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes revenue by source:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 (1) |  | 2018 |  | 2017 (1)
($ in thousands) |  |  |  |  |  |  |
Investment management fees |  |  |  |  |  |  |
Open-end funds | $ | 62,466 |  |  | $ | 51,190 |  |  | $ | 174,032 |  |  | $ | 120,902 |
Closed-end funds | 10,614 |  |  | 11,243 |  |  | 31,161 |  |  | 33,495 |
Retail separate accounts | 19,532 |  |  | 14,686 |  |  | 53,152 |  |  | 38,879 |
Institutional accounts | 24,614 |  |  | 16,208 |  |  | 56,210 |  |  | 30,140 |
Structured products | 3,602 |  |  | 2,822 |  |  | 7,996 |  |  | 4,483 |
Other products | 885 |  |  | 1,146 |  |  | 2,806 |  |  | 2,729 |
Total investment management fees | 121,713 |  |  | 97,295 |  |  | 325,357 |  |  | 230,628 |
Distribution and service fees | 13,730 |  |  | 11,482 |  |  | 39,886 |  |  | 32,704 |
Administration and shareholder service fees | 16,567 |  |  | 14,699 |  |  | 48,272 |  |  | 33,156 |
Other income and fees | 200 |  |  | 199 |  |  | 655 |  |  | 1,095 |
Total revenues | $ | 152,210 |  |  | $ | 123,675 |  |  | $ | 414,170 |  |  | $ | 297,583 |
(1) | Prior period amounts have not been adjusted and are reported in accordance with historical accounting under ASC 605, Revenue Recognition.
Schedule of New Accounting Pronouncements and Changes in Accounting Principles | The impact of adoption of ASC 606 on the Company's condensed consolidated statement of operations was as follows:
| Three Months Ended September 30, 2018 |  | Nine Months Ended September 30, 2018
($ in thousands) | As Reported |  | Balance Under Prior ASC 605 |  | Effect of Change Higher/(Lower) |  | As Reported |  | Balance Under Prior ASC 605 |  | Effect of Change Higher/(Lower)
Revenues |  |  |  |  |  |  |  |  |  |  |
Distribution and service fees | $ | 13,730 |  |  | $ | 11,625 |  |  | $ | 2,105 |  |  | $ | 39,886 |  |  | $ | 34,451 |  |  | $ | 5,435 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Distribution and other asset-based expenses | $ | 25,386 |  |  | $ | 23,281 |  |  | $ | 2,105 |  |  | $ | 71,398 |  |  | $ | 65,963 |  |  | $ | 5,435 |

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