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Investment In Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Company's share in the earnings of LSV | $ 152,550 | $ 126,103 | $ 137,057 |
Distributions received from LSV | $ 143,517 | 125,224 | 141,767 |
LSV Asset Management [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Ownership interest in LSV | 38.90% |  |  |
Total investment in LSV | $ 59,492 |  |  |
Company's share in the earnings of LSV | 152,550 | 126,103 | 138,407 |
Distributions received from LSV | $ 143,517 | $ 125,224 | $ 141,767 |
Maximum [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Ownership interest in LSV | 50.00% |  |  |
LSV Asset Management [Member] | Financial Guarantee [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Maximum exposure from guaranty of LSV Employee Group III obligations |  |  |  | $ 24,930
LSV Employee Group III [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Purchase price of partnership interest in LSV |  |  |  | 77,700
Loans payable by LSV Employee Group III |  |  |  | 69,930
LSV Employee Group III [Member] | Financial Guarantee [Member] |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Maximum exposure from guaranty of LSV Employee Group III obligations |  |  |  | $ 45,000

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