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Revenues (Tables) | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes revenue by source:
| Years Ended December 31,
($ in thousands) | 2018 |  | 2017 (1) |  | 2016 (1)
Investment management fees |  |  |  |  |
Open-end funds | $ | 231,175 |  |  | $ | 175,260 |  |  | $ | 129,542 |
Closed-end funds | 41,455 |  |  | 44,687 |  |  | 43,342 |
Retail separate accounts | 73,532 |  |  | 54,252 |  |  | 40,155 |
Institutional accounts | 77,711 |  |  | 46,600 |  |  | 18,707 |
Structured products | 9,622 |  |  | 6,302 |  |  | 2,211 |
Other products | 3,526 |  |  | 3,974 |  |  | 1,273 |
Total investment management fees | 437,021 |  |  | 331,075 |  |  | 235,230 |
Distribution and service fees | 50,715 |  |  | 44,322 |  |  | 48,250 |
Administration and shareholder service fees | 63,614 |  |  | 48,996 |  |  | 38,261 |
Other income and fees | 885 |  |  | 1,214 |  |  | 813 |
Total revenues | $ | 552,235 |  |  | $ | 425,607 |  |  | $ | 322,554 |
(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 consolidated statement of operations was as follows:
| Year Ended December 31, 2018
($ in thousands) | As Reported |  | Balance Under Prior ASC 605 |  | Effect of Change Higher/(Lower)
Revenues |  |  |  |  |
Distribution and service fees | $ | 50,715 |  |  | $ | 44,739 |  |  | $ | 5,976 |
Operating Expenses |  |  |  |  |
Distribution and other asset-based expenses | $ | 92,441 |  |  | $ | 86,465 |  |  | $ | 5,976 |

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