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Investment in Unconsolidated Affiliates (Condensed Statements of Operations of LSV) (Details) - LSV Asset Management - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Revenues	$ 517,203	$ 491,872	$ 399,462
Net income	$ 410,846	$ 392,141	$ 323,381

X

- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

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- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

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