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Revenues (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes revenue by source:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 (1) |  | 2018 |  | 2017 (1)
($ in thousands) |  |  |  |  |  |  |
Investment management fees |  |  |  |  |  |  |
Open-end funds | $ | 57,192 |  |  | $ | 39,186 |  |  | $ | 111,566 |  |  | $ | 69,712 |
Closed-end funds | 10,168 |  |  | 11,174 |  |  | 20,547 |  |  | 22,253 |
Retail separate accounts | 17,091 |  |  | 12,759 |  |  | 33,620 |  |  | 24,192 |
Institutional accounts | 15,778 |  |  | 8,790 |  |  | 31,596 |  |  | 13,931 |
Structured products | 2,068 |  |  | 1,163 |  |  | 4,394 |  |  | 1,662 |
Other products | 871 |  |  | 990 |  |  | 1,921 |  |  | 1,583 |
Total investment management fees | 103,168 |  |  | 74,062 |  |  | 203,644 |  |  | 133,333 |
Distribution and service fees | 13,549 |  |  | 10,439 |  |  | 26,156 |  |  | 21,222 |
Administration and shareholder service fees | 15,967 |  |  | 9,476 |  |  | 31,705 |  |  | 18,457 |
Other income and fees | 248 |  |  | 155 |  |  | 455 |  |  | 896 |
Total revenues | $ | 132,932 |  |  | $ | 94,132 |  |  | $ | 261,960 |  |  | $ | 173,908 |
(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 June 30, 2018 |  | Six Months Ended June 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 | $ | 13,549 |  |  | $ | 11,455 |  |  | $ | 2,094 |  |  | $ | 26,156 |  |  | $ | 22,826 |  |  | $ | 3,330 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Distribution and other asset-based expenses | $ | 23,721 |  |  | $ | 21,627 |  |  | $ | 2,094 |  |  | $ | 46,012 |  |  | $ | 42,682 |  |  | $ | 3,330 |

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