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