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Revenues (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes revenue by source:
| Three Months Ended March 31,
| 2018 |  | 2017 (1)
($ in thousands) |  |  |
Investment management fees |  |  |
Open-end funds | $ | 54,361 |  |  | $ | 30,526 |
Closed-end funds | 10,378 |  |  | 11,079 |
Retail separate accounts | 16,529 |  |  | 11,434 |
Institutional accounts | 15,818 |  |  | 5,141 |
Structured products | 2,326 |  |  | 498 |
Other products | 1,064 |  |  | 593 |
Total investment management fees | 100,476 |  |  | 59,271 |
Distribution and service fees | 12,607 |  |  | 10,783 |
Administration and shareholder service fees | 15,738 |  |  | 8,981 |
Other income and fees | 207 |  |  | 741 |
Total revenues | $ | 129,028 |  |  | $ | 79,776 |
(1) | Prior period amounts have not been adjusted
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 March 31, 2018
($ in Thousands) | As Reported |  | Balance Under Prior ASC 605 |  | Effect of Change Higher/(Lower)
Revenues |  |  |  |  |
Distribution and service fees | $ | 12,607 |  |  | $ | 11,371 |  |  | $ | 1,236 |
Operating Expenses |  |  |  |  |
Distribution and other asset-based expenses | 22,291 |  |  | 21,055 |  |  | 1,236 |

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