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Revenues | 12 Months Ended
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Dec. 31, 2018
Revenue from Contract with Customer [Abstract] |
Revenues | Revenues Revenue Disaggregated by Source 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 Financial Statement Impact of the Adoption of ASC 606 The adoption of ASC 606 resulted in a change from the Company’s treatment under ASC 605 whereby front-end sales charges earned for the sale execution of certain share classes were previously presented net of the amounts retained by unaffiliated third-party dealers and banks. These front-end sales charges earned are now presented on a gross basis under ASC 606. 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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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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