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Investment in Unconsolidated Affiliates (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items]
Company's share in the earnings of LSV	$ 151,891	$ 159,791	$ 152,550
Distributions received from LSV	$ 136,820	166,941	143,517
LSV Asset Management
Investments in and Advances to Affiliates [Line Items]
Ownership interest in LSV	38.90%
Total investment in LSV	$ 67,413
Company's share in the earnings of LSV	151,891	159,791	152,550
Distributions received from LSV	$ 136,820	$ 166,941	$ 143,517

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