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Investment in Unconsolidated Affiliate (Balance Sheets) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Current assets | $ 1,232,899 | $ 1,304,845
Total Assets | 2,053,600 | 2,151,370
Current liabilities | 236,125 | 293,565
Total Liabilities and Shareholders' Equity | 2,053,600 | 2,151,370
Equity Method Investment, Nonconsolidated Investee | LSV Asset Management |  |
Schedule of Equity Method Investments [Line Items] |  |
Current assets | 114,909 | 144,547
Non-current assets | 4,625 | 5,048
Total Assets | 119,534 | 149,595
Current liabilities | 55,851 | 46,828
Non-current liabilities | 4,980 | 5,326
Partners’ capital | 58,703 | 97,441
Total Liabilities and Shareholders' Equity | $ 119,534 | $ 149,595

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