Investment In Unconsolidated Affiliates (Narrative) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
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Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Oct. 13, 2016 |
Apr. 30, 2016 |
Mar. 31, 2016 |
Oct. 31, 2012 |
| Investments in and Advances to Affiliates [Line Items] |
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| Distributions received from unconsolidated affiliate |
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$ 102,246
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$ 116,913
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| Company's share in the earnings of equity method investee |
$ 32,565
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$ 33,595
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92,042
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104,917
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| LSV Employee Group III [Member] |
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| Investments in and Advances to Affiliates [Line Items] |
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| Purchase of partnership interest value |
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$ 77,700
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| Amount of purchase price financed through term loans |
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69,930
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| Financial Guarantee [Member] | L S V Asset Management [Member] |
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| Investments in and Advances to Affiliates [Line Items] |
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| Amount of guarantor's obligation, maximum exposure |
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24,930
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| Financial Guarantee [Member] | LSV Employee Group III [Member] |
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| Investments in and Advances to Affiliates [Line Items] |
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| Amount of guarantor's obligation, maximum exposure |
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$ 45,000
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| Financial Guarantee [Member] | LSV Employee Group III [Member] | Subsequent Event [Member] |
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| Investments in and Advances to Affiliates [Line Items] |
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| Amount of guarantor's obligation, maximum exposure |
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$ 7,914
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| Amount of guarantor's obligation, current carrying value |
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$ 0
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| L S V Asset Management [Member] |
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| Investments in and Advances to Affiliates [Line Items] |
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| Equity method investment, ownership percentage |
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38.90%
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39.20%
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| Total investment in equity method investee |
39,376
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39,376
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| Distributions received from unconsolidated affiliate |
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102,246
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116,913
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| Company's share in the earnings of equity method investee |
$ 32,565
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$ 33,595
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$ 92,042
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$ 106,267
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| Maximum [Member] |
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| Investments in and Advances to Affiliates [Line Items] |
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| Equity method investment, ownership percentage |
50.00%
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50.00%
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