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Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Apr. 13, 2017 | Apr. 30, 2016 | Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Distributions received from unconsolidated affiliate | $ 35,265 | $ 34,525 |  |  |
Company's share in the earnings of equity method investee | 33,565 | $ 29,192 |  |  |
LSV Employee Group III [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Purchase of partnership interest value |  |  |  |  | $ 77,700
Amount of purchase price financed through term loans |  |  |  |  | 69,930
Financial Guarantee [Member] | L S V Asset Management [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  |  |  | 24,930
Financial Guarantee [Member] | LSV Employee Group III [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  |  |  | $ 45,000
Financial Guarantee [Member] | LSV Employee Group III [Member] | Subsequent Event [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  | $ 1,065 |  |
Amount of guarantor's obligation, current carrying value |  |  | $ 0 |  |
L S V Asset Management [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity method investment, ownership percentage |  | 39.20% |  | 38.90% |
Total investment in equity method investee | 48,759 |  |  |  |
Distributions received from unconsolidated affiliate | 35,265 | $ 34,525 |  |  |
Company's share in the earnings of equity method investee | $ 33,565 | $ 29,192 |  |  |
Maximum [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  |  |  |

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