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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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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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