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Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Distributions received from unconsolidated affiliate |  |  | $ 89,362 | $ 75,142
Company's share in the earnings of equity method investee | $ 41,073 | $ 36,315 | $ 81,680 | 69,880
LSV Asset Management |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Equity method investment, ownership percentage | 38.90% |  | 38.90% |
Total investment in equity method investee | $ 51,810 |  | $ 51,810 |
Distributions received from unconsolidated affiliate |  |  | 89,362 | 75,142
Company's share in the earnings of equity method investee | $ 41,073 | $ 36,315 | $ 81,680 | $ 69,880

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