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Investment In Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jan. 31, 2017 | Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Company's share in the earnings of LSV | $ 126,103 | $ 137,057 | $ 127,786 |  |
Distributions received from LSV | $ 125,224 | $ 141,767 | 137,866 |  |
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
Financial Guarantee [Member] | LSV Asset Management [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Maximum exposure from guaranty of LSV Employee Group III obligations |  |  |  |  | 24,930
Financial Guarantee [Member] | LSV Employee Group III [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Maximum exposure from guaranty of LSV Employee Group III obligations |  |  |  |  | $ 45,000
Financial Guarantee [Member] | LSV Employee Group III [Member] | Subsequent Event [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Maximum exposure from guaranty of LSV Employee Group III obligations |  |  |  | $ 5,657 |
Current carrying value of guaranty of LSV Employee Group III obligations |  |  |  | $ 0 |
LSV Asset Management [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Ownership interest in LSV | 38.90% | 39.20% |  |  |
Total investment in LSV | $ 50,459 |  |  |  |
Company's share in the earnings of LSV | 126,103 | $ 138,407 | 140,211 |  |
Distributions received from LSV | $ 125,224 | $ 141,767 | $ 137,866 |  |
Maximum [Member] |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |
Ownership interest in LSV | 50.00% |  |  |  |

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