Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands |
3 Months Ended |
6 Months Ended |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
$ 91,360
|
$ 104,399
|
$ 178,839
|
$ 209,363
|
| Operating expenses |
68,635
|
74,715
|
133,989
|
152,411
|
| ASU 2014-09 |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
(4,100)
|
|
(8,200)
|
|
| Operating expenses |
(4,100)
|
|
(8,200)
|
|
| Investment management fees |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
78,042
|
88,998
|
152,453
|
178,128
|
| Investment management fees | Mutual funds |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
52,351
|
63,394
|
102,927
|
126,465
|
| Investment management fees | ETF's |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
2,040
|
2,137
|
4,056
|
4,066
|
| Investment management fees | Separate accounts and other vehicles |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
23,817
|
23,589
|
45,867
|
46,993
|
| Performance-based investment fees | Separate accounts and other vehicles |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
(166)
|
(122)
|
(397)
|
604
|
| Fund administration and distribution fees |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
13,318
|
15,401
|
26,386
|
31,235
|
| Administration fees | Mutual funds |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
5,391
|
5,639
|
10,636
|
11,189
|
| Administration fees | ETF's |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
276
|
203
|
546
|
389
|
| Fund distribution fees | Mutual funds |
|
|
|
|
| Disaggregation of revenue |
|
|
|
|
| Total revenue |
$ 7,651
|
$ 9,559
|
$ 15,204
|
$ 19,657
|