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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Current assets $ 1,370,614 $ 1,300,977
Total Assets 2,191,801 2,167,256
Current liabilities 253,462 317,275
Total Liabilities and Shareholders' Equity 2,191,801 2,167,256
Equity Method Investment, Nonconsolidated Investee | LSV Asset Management    
Schedule of Equity Method Investments [Line Items]    
Current assets 123,325 151,515
Non-current assets 4,426 4,296
Total Assets 127,751 155,811
Current liabilities 69,349 77,077
Non-current liabilities 4,058 4,620
Partners’ capital 54,344 74,114
Total Liabilities and Shareholders' Equity $ 127,751 $ 155,811