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Investment In Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Oct. 16, 2015 | Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Distributions received from unconsolidated affiliate |  |  | $ 116,913 | $ 103,592 |  |
Company's share in the earnings of equity method investee | $ 33,595 | $ 37,963 | 104,917 | 104,080 |  |
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 |  |  |  |  | $ 23,781 |
Amount of guarantor's obligation, current carrying value |  |  |  |  | $ 0 |
L S V Asset Management [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Total investment in equity method investee | 42,294 |  | 42,294 |  |  |
Distributions received from unconsolidated affiliate |  |  | 116,913 | 103,592 |  |
Company's share in the earnings of equity method investee | $ 33,595 | $ 38,237 | $ 106,267 | $ 104,953 |  |
Maximum [Member] |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |  |

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- Definition This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Article 5 + Details
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