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Investment In Unconsolidated Affiliate (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Oct. 31, 2012
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |
Distributions received from unconsolidated affiliate |  |  | $ 117,447 | $ 102,246 |  |  |
Company's share in the earnings of equity method investee | $ 39,333 | $ 32,565 | 109,213 | 92,042 |  |  |
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
LSV Employee Group III [Member] | Financial Guarantee [Member] |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  |  |  |  |  | 45,000
L S V Asset Management [Member] | Financial Guarantee [Member] |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |
Amount of guarantor's obligation, maximum exposure |  |  |  |  |  |  | $ 24,930
L S V Asset Management [Member] |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  | 38.90% | 39.20% |
Total investment in equity method investee | 42,225 |  | 42,225 |  |  |  |
Distributions received from unconsolidated affiliate |  |  | 117,447 | 102,246 |  |  |
Company's share in the earnings of equity method investee | $ 39,333 | $ 32,565 | $ 109,213 | $ 92,042 |  |  |
Maximum [Member] |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |
Equity method investment, ownership percentage | 50.00% |  | 50.00% |  |  |  |

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- Definition Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: 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=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080555-108585 + Details
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