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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Current assets $ 1,324,851 $ 1,300,977
Total Assets 2,150,901 2,167,256
Current liabilities 215,912 317,275
Total Liabilities and Shareholders' Equity 2,150,901 2,167,256
Equity Method Investment, Nonconsolidated Investee | LSV Asset Management    
Schedule of Equity Method Investments [Line Items]    
Current assets 126,324 151,515
Non-current assets 4,098 4,296
Total Assets 130,422 155,811
Current liabilities 40,084 77,077
Non-current liabilities 4,435 4,620
Partners’ capital 85,903 74,114
Total Liabilities and Shareholders' Equity $ 130,422 $ 155,811